CVE-2022-24771 (published 2022-03-18T14:15Z)

Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.3.0, RSA PKCS#1 v1.5 signature verification code is lenient in checking the digest algorithm structure. This can allow a crafted structure that steals padding bytes and uses unchecked portion of the PKCS#1 encoded message to forge a signature when a low public exponent is being used. The issue has been addressed in `node-forge` version 1.3.0. There are currently no known workarounds.

Severity: MEDIUM
CVSS v2 base score: 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N)
CVSS v3 base score: 7.5, HIGH (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

Weakness information:
cwe_id: CWE-347
cwe_name: Improper Verification of Cryptographic Signature
description: The product does not verify, or incorrectly verifies, the cryptographic signature for data.
extended_description: 
            
            
         
         

Fix information:
repo_url: https://github.com/digitalbazaar/forge
commit_details: repo_url: https://github.com/digitalbazaar/forge
author: David I. Lehn
author_date: 2022-03-07 19:53:18-05:00
msg: Fix signature verification issues.

**SECURITY**: Three RSA PKCS#1 v1.5 signature verification issues were
reported by Moosa Yahyazadeh (moosa-yahyazadeh@uiowa.edu):

- Leniency in checking `digestAlgorithm` structure can lead to signature
  forgery.
  - The code is lenient in checking the digest algorithm structure. This can
    allow a crafted structure that steals padding bytes and uses unchecked
    portion of the PKCS#1 encoded message to forge a signature when a low
    public exponent is being used.
- Failing to check tailing garbage bytes can lead to signature forgery.
  - The code does not check for tailing garbage bytes after decoding a
    `DigestInfo` ASN.1 structure. This can allow padding bytes to be removed
    and garbage data added to forge a signature when a low public exponent is
    being used.
- Leniency in checking type octet.
  - `DigestInfo` is not properly checked for proper ASN.1 structure. This can
    lead to successful verification with signatures that contain invalid
    structures but a valid digest.

For more information, please see "Bleichenbacher's RSA signature forgery based
on implementation error" by Hal Finney:
https://mailarchive.ietf.org/arch/msg/openpgp/5rnE9ZRN1AokBVj3VqblGlP63QE/

Fixed with the following:

- [asn1] `fromDer` is now more strict and will default to ensuring all
  input bytes are parsed or throw an error. A new option `parseAllBytes`
  can disable this behavior.
  - **NOTE**: The previous behavior is being changed since it can lead
    to security issues with crafted inputs. It is possible that code
    doing custom DER parsing may need to adapt to this new behavior and
    optional flag.
- [rsa] Add and use a validator to check for proper structure of parsed
  ASN.1 `RSASSA-PKCS-v1_5` `DigestInfo` data. Additionally check that
  the hash algorithm identifier is a known value. An invalid
  `DigestInfo` or algorithm identifier will now cause an error to be
  thrown.
- [oid] Added `1.2.840.113549.2.2` / `md2` for hash algorithm checking.
- [tests] Tests were added for all of the reported issues. A private
  verify option was added to assist in checking multiple possible
  failures in the test data.
repository: repo_url: https://github.com/digitalbazaar/forge
repo_name: digitalbazaar/forge
description: A native implementation of TLS in Javascript and tools to write crypto-based and network-heavy webapps
repo_language: JavaScript
owner: digitalbazaar
file_changes: filename: CHANGELOG.md
change_type: ModificationType.MODIFY
diff: @@ -3,8 +3,46 @@ Forge ChangeLog
 
 ## 1.3.0 - 2022-XXX
 
+### Security
+- **SECURITY**: Three RSA PKCS#1 v1.5 signature verification issues were
+  reported by Moosa Yahyazadeh (moosa-yahyazadeh@uiowa.edu).
+  - Leniency in checking `digestAlgorithm` structure can lead to signature
+    forgery.
+    - The code is lenient in checking the digest algorithm structure. This can
+      allow a crafted structure that steals padding bytes and uses unchecked
+      portion of the PKCS#1 encoded message to forge a signature when a low
+      public exponent is being used. For more information, please see
+      ["Bleichenbacher's RSA signature forgery based on implementation
+      error"](https://mailarchive.ietf.org/arch/msg/openpgp/5rnE9ZRN1AokBVj3VqblGlP63QE/)
+      by Hal Finney.
+  - Failing to check tailing garbage bytes can lead to signature forgery.
+    - The code does not check for tailing garbage bytes after decoding a
+      `DigestInfo` ASN.1 structure. This can allow padding bytes to be removed
+      and garbage data added to forge a signature when a low public exponent is
+      being used.  For more information, please see ["Bleichenbacher's RSA
+      signature forgery based on implementation
+      error"](https://mailarchive.ietf.org/arch/msg/openpgp/5rnE9ZRN1AokBVj3VqblGlP63QE/)
+      by Hal Finney.
+  - Leniency in checking type octet.
+    - `DigestInfo` is not properly checked for proper ASN.1 structure. This can
+      lead to successful verification with signatures that contain invalid
+      structures but a valid digest.
+
 ### Fixed
 - [asn1] Add fallback to pretty print invalid UTF8 data.
+- [asn1] `fromDer` is now more strict and will default to ensuring all input
+  bytes are parsed or throw an error. A new option `parseAllBytes` can disable
+  this behavior.
+  - **NOTE**: The previous behavior is being changed since it can lead to
+    security issues with crafted inputs. It is possible that code doing custom
+    DER parsing may need to adapt to this new behavior and optional flag.
+- [rsa] Add and use a validator to check for proper structure of parsed ASN.1
+  `RSASSA-PKCS-v1_5` `DigestInfo` data. Additionally check that the hash
+  algorithm identifier is a known value. An invalid `DigestInfo` or algorithm
+  identifier will now cause an error to be thrown.
+
+### Added
+- [oid] Added `1.2.840.113549.2.2` / `md2` for hash algorithm checking.
 
 ## 1.2.1 - 2022-01-11
 

programming_language: Markdown
filename: asn1.js
change_type: ModificationType.MODIFY
diff: @@ -411,6 +411,8 @@ var _getValueLength = function(bytes, remaining) {
  * @param [options] object with options or boolean strict flag
  *          [strict] true to be strict when checking value lengths, false to
  *            allow truncated values (default: true).
+ *          [parseAllBytes] true to ensure all bytes are parsed
+ *            (default: true)
  *          [decodeBitStrings] true to attempt to decode the content of
  *            BIT STRINGs (not OCTET STRINGs) using strict mode. Note that
  *            without schema support to understand the data context this can
@@ -418,24 +420,31 @@ var _getValueLength = function(bytes, remaining) {
  *            flag will be deprecated or removed as soon as schema support is
  *            available. (default: true)
  *
+ * @throws Will throw an error for various malformed input conditions.
+ *
  * @return the parsed asn1 object.
  */
 asn1.fromDer = function(bytes, options) {
   if(options === undefined) {
     options = {
       strict: true,
+      parseAllBytes: true,
       decodeBitStrings: true
     };
   }
   if(typeof options === 'boolean') {
     options = {
       strict: options,
+      parseAllBytes: true,
       decodeBitStrings: true
     };
   }
   if(!('strict' in options)) {
     options.strict = true;
   }
+  if(!('parseAllBytes' in options)) {
+    options.parseAllBytes = true;
+  }
   if(!('decodeBitStrings' in options)) {
     options.decodeBitStrings = true;
   }
@@ -445,7 +454,15 @@ asn1.fromDer = function(bytes, options) {
     bytes = forge.util.createBuffer(bytes);
   }
 
-  return _fromDer(bytes, bytes.length(), 0, options);
+  var byteCount = bytes.length();
+  var value = _fromDer(bytes, bytes.length(), 0, options);
+  if(options.parseAllBytes && bytes.length() !== 0) {
+    var error = new Error('Unparsed DER bytes remain after ASN.1 parsing.');
+    error.byteCount = byteCount;
+    error.remaining = bytes.length();
+    throw error;
+  }
+  return value;
 };
 
 /**

programming_language: JavaScript
filename: oids.js
change_type: ModificationType.MODIFY
diff: @@ -47,6 +47,7 @@ _IN('1.3.14.3.2.29', 'sha1WithRSASignature');
 _IN('2.16.840.1.101.3.4.2.1', 'sha256');
 _IN('2.16.840.1.101.3.4.2.2', 'sha384');
 _IN('2.16.840.1.101.3.4.2.3', 'sha512');
+_IN('1.2.840.113549.2.2', 'md2');
 _IN('1.2.840.113549.2.5', 'md5');
 
 // pkcs#7 content types

programming_language: SQL
filename: rsa.js
change_type: ModificationType.MODIFY
diff: @@ -264,6 +264,40 @@ var publicKeyValidator = forge.pki.rsa.publicKeyValidator = {
   }]
 };
 
+// validator for a DigestInfo structure
+var digestInfoValidator = {
+  name: 'DigestInfo',
+  tagClass: asn1.Class.UNIVERSAL,
+  type: asn1.Type.SEQUENCE,
+  constructed: true,
+  value: [{
+    name: 'DigestInfo.DigestAlgorithm',
+    tagClass: asn1.Class.UNIVERSAL,
+    type: asn1.Type.SEQUENCE,
+    constructed: true,
+    value: [{
+      name: 'DigestInfo.DigestAlgorithm.algorithmIdentifier',
+      tagClass: asn1.Class.UNIVERSAL,
+      type: asn1.Type.OID,
+      constructed: false,
+      capture: 'algorithmIdentifier'
+    }, {
+      // NULL paramters
+      name: 'DigestInfo.DigestAlgorithm.parameters',
+      tagClass: asn1.Class.UNIVERSAL,
+      type: asn1.Type.NULL,
+      constructed: false
+    }]
+  }, {
+    // digest
+    name: 'DigestInfo.digest',
+    tagClass: asn1.Class.UNIVERSAL,
+    type: asn1.Type.OCTETSTRING,
+    constructed: false,
+    capture: 'digest'
+  }]
+};
+
 /**
  * Wrap digest in DigestInfo object.
  *
@@ -1092,15 +1126,27 @@ pki.setRsaPublicKey = pki.rsa.setPublicKey = function(n, e) {
    *          a Forge PSS object for RSASSA-PSS,
    *          'NONE' or null for none, DigestInfo will not be expected, but
    *            PKCS#1 v1.5 padding will still be used.
+   * @param options optional verify options
+   *          _parseAllDigestBytes testing flag to control parsing of all
+   *            digest bytes. Unsupported and not for general usage.
+   *            (default: true)
    *
    * @return true if the signature was verified, false if not.
    */
-  key.verify = function(digest, signature, scheme) {
+  key.verify = function(digest, signature, scheme, options) {
     if(typeof scheme === 'string') {
       scheme = scheme.toUpperCase();
     } else if(scheme === undefined) {
       scheme = 'RSASSA-PKCS1-V1_5';
     }
+    if(options === undefined) {
+      options = {
+        _parseAllDigestBytes: true
+      };
+    }
+    if(!('_parseAllDigestBytes' in options)) {
+      options._parseAllDigestBytes = true;
+    }
 
     if(scheme === 'RSASSA-PKCS1-V1_5') {
       scheme = {
@@ -1108,9 +1154,37 @@ pki.setRsaPublicKey = pki.rsa.setPublicKey = function(n, e) {
           // remove padding
           d = _decodePkcs1_v1_5(d, key, true);
           // d is ASN.1 BER-encoded DigestInfo
-          var obj = asn1.fromDer(d);
+          var obj = asn1.fromDer(d, {
+            parseAllBytes: options._parseAllDigestBytes
+          });
+
+          // validate DigestInfo
+          var capture = {};
+          var errors = [];
+          if(!asn1.validate(obj, digestInfoValidator, capture, errors)) {
+            var error = new Error(
+              'ASN.1 object does not contain a valid RSASSA-PKCS1-v1_5 ' +
+              'DigestInfo value.');
+            error.errors = errors;
+            throw error;
+          }
+          // check hash algorithm identifier
+          // FIXME: add support to vaidator for strict value choices
+          var oid = asn1.derToOid(capture.algorithmIdentifier);
+          if(!(oid === forge.oids.md2 ||
+            oid === forge.oids.md5 ||
+            oid === forge.oids.sha1 ||
+            oid === forge.oids.sha256 ||
+            oid === forge.oids.sha384 ||
+            oid === forge.oids.sha512)) {
+            var error = new Error(
+              'Unknown RSASSA-PKCS1-v1_5 DigestAlgorithm identifier.');
+            error.oid = oid;
+            throw error;
+          }
+
           // compare the given digest to the decrypted one
-          return digest === obj.value[1].value;
+          return digest === capture.digest;
         }
       };
     } else if(scheme === 'NONE' || scheme === 'NULL' || scheme === null) {

programming_language: JavaScript
filename: rsa.js
change_type: ModificationType.MODIFY
diff: @@ -1,5 +1,6 @@
 var ASSERT = require('assert');
 var FORGE = require('../../lib/forge');
+var JSBN = require('../../lib/jsbn');
 var MD = require('../../lib/md.all');
 var MGF = require('../../lib/mgf');
 var PKI = require('../../lib/pki');
@@ -773,5 +774,154 @@ var UTIL = require('../../lib/util');
         });
       }
     })();
+
+    describe('bad data', function() {
+      // params for tests
+
+      // public modulus / 256 bytes
+      var N = new JSBN.BigInteger(
+        'E932AC92252F585B3A80A4DD76A897C8B7652952FE788F6EC8DD640587A1EE56' +
+        '47670A8AD4C2BE0F9FA6E49C605ADF77B5174230AF7BD50E5D6D6D6D28CCF0A8' +
+        '86A514CC72E51D209CC772A52EF419F6A953F3135929588EBE9B351FCA61CED7' +
+        '8F346FE00DBB6306E5C2A4C6DFC3779AF85AB417371CF34D8387B9B30AE46D7A' +
+        '5FF5A655B8D8455F1B94AE736989D60A6F2FD5CADBFFBD504C5A756A2E6BB5CE' +
+        'CC13BCA7503F6DF8B52ACE5C410997E98809DB4DC30D943DE4E812A47553DCE5' +
+        '4844A78E36401D13F77DC650619FED88D8B3926E3D8E319C80C744779AC5D6AB' +
+        'E252896950917476ECE5E8FC27D5F053D6018D91B502C4787558A002B9283DA7',
+        16);
+
+      // private exponent
+      var d = new JSBN.BigInteger(
+        '009b771db6c374e59227006de8f9c5ba85cf98c63754505f9f30939803afc149' +
+        '8eda44b1b1e32c7eb51519edbd9591ea4fce0f8175ca528e09939e48f37088a0' +
+        '7059c36332f74368c06884f718c9f8114f1b8d4cb790c63b09d46778bfdc4134' +
+        '8fb4cd9feab3d24204992c6dd9ea824fbca591cd64cf68a233ad0526775c9848' +
+        'fafa31528177e1f8df9181a8b945081106fd58bd3d73799b229575c4f3b29101' +
+        'a03ee1f05472b3615784d9244ce0ed639c77e8e212ab52abddf4a928224b6b6f' +
+        '74b7114786dd6071bd9113d7870c6b52c0bc8b9c102cfe321dac357e030ed6c5' +
+        '80040ca41c13d6b4967811807ef2a225983ea9f88d67faa42620f42a4f5bdbe0' +
+        '3b',
+        16);
+
+      // public exponent
+      var e = new JSBN.BigInteger('3');
+
+      // hash function
+      // H = SHA-256 (OID = 0x608648016503040201)
+
+      // message
+      var m = 'hello world!';
+
+      // to-be-signed RSA PKCS#1 v1.5 signature scheme input structure
+      // I
+
+      // signature value obtained by I^d mod N
+      // S
+
+      function _checkBadTailingGarbage(publicKey, S) {
+        var md = MD.sha256.create();
+        md.update(m);
+
+        ASSERT.throws(function() {
+          publicKey.verify(md.digest().getBytes(), S);
+        }, {
+          message: 'Unparsed DER bytes remain after ASN.1 parsing.'
+        });
+      }
+
+      function _checkBadDigestInfo(publicKey, S, skipTailingGarbage) {
+        var md = MD.sha256.create();
+        md.update(m);
+
+        ASSERT.throws(function() {
+          publicKey.verify(md.digest().getBytes(), S, undefined, {
+            _parseAllDigestBytes: !skipTailingGarbage
+          });
+        }, {
+          message: 'ASN.1 object does not contain a valid RSASSA-PKCS1-v1_5 DigestInfo value.'
+        });
+      }
+
+      it('should check DigestInfo structure', function() {
+        var publicKey = RSA.setPublicKey(N, e);
+        var S = UTIL.binary.hex.decode(
+          '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');
+
+        _checkBadDigestInfo(publicKey, S);
+      });
+
+      it('should check tailing garbage and DigestInfo [1]', function() {
+        var publicKey = RSA.setPublicKey(N, e);
+        var S = UTIL.binary.hex.decode(
+          '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');
+
+        _checkBadTailingGarbage(publicKey, S);
+        _checkBadDigestInfo(publicKey, S, true);
+      });
+
+      it('should check tailing garbage and DigestIfno [2]', function() {
+        var publicKey = RSA.setPublicKey(N, e);
+        var S = UTIL.binary.hex.decode(
+          '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');
+
+        _checkBadTailingGarbage(publicKey, S);
+        _checkBadDigestInfo(publicKey, S, true);
+      });
+
+      it('should check tailing garbage and DigestInfo [e=3]', function() {
+        var N = new JSBN.BigInteger(
+          '29438513389594867490232201282478838726734464161887801289068585100507839535636256317277708295678804401391394313946142335874609638666081950936114152574870224034382561784743283763961349980806819078028975594777103388280272392844112380900374508170221075553517641170327441791034393719271744724924194371070527213991317221667249077972700842199037403799480569910844701030644322616045408039715278394572328099192023924503077673178227614549351191204851805076359472439160130994385433568113626206477097769842080459156024112389406200687233341779381667082591421496870666931268548504674362230725756397511775557878046572472650613407143');
+        var e = new JSBN.BigInteger('3');
+        var publicKey = RSA.setPublicKey(N, e);
+
+        var S = UTIL.binary.hex.decode(
+          '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');
+
+        _checkBadTailingGarbage(publicKey, S);
+        _checkBadDigestInfo(publicKey, S, true);
+      });
+
+      it('should check tailing garbage and DigestInfo [e=5]', function() {
+        var N = new JSBN.BigInteger(
+          '29438513389594867490232201282478838726734464161887801289068585100507839535636256317277708295678804401391394313946142335874609638666081950936114152574870224034382561784743283763961349980806819078028975594777103388280272392844112380900374508170221075553517641170327441791034393719271744724924194371070527213991317221667249077972700842199037403799480569910844701030644322616045408039715278394572328099192023924503077673178227614549351191204851805076359472439160130994385433568113626206477097769842080459156024112389406200687233341779381667082591421496870666931268548504674362230725756397511775557878046572472650613407143');
+        var e = new JSBN.BigInteger('5');
+        var publicKey = RSA.setPublicKey(N, e);
+
+        var S = UTIL.binary.hex.decode(
+          '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');
+
+        _checkBadTailingGarbage(publicKey, S);
+        _checkBadDigestInfo(publicKey, S, true);
+      });
+
+      it('should check tailing garbage and DigestInfo [e=17]', function() {
+        var N = new JSBN.BigInteger(
+          '928365641661298526294114382771769657905695995680009680444002258089796055192245321020911051590379097587133341820043795407471021630328875171430160513961779154294247563032373839871165519961382202811828883364651574763124699947662060849683176689286181021501400261976653416725246403933613615758181648971537689642956474563961490989544033629566558036444831495046301215543198107208071526376318961481739278769122885031686763776874806317352741548232110892401401727195758835975800106904020775937891505819798776295294696516670437057465296389148672556848624501468669295285428387365416747516180652630054765393335211528084329716917821726670549155619986875030049107668205064454104328601041931972319966348825621299693193542460060799067674344247887198933507132592770898312271636011037138984729256515515185153334743685479709085410902269777563691615719884708908509618352792737826421059819474305949001978916949447029010362775778664826653636547333219983468955600305523140183269580452792812503399042201081785972707218144968460623663922470814889738564730816412201128810370324070680245854669130551872958017494277468722193869883705529583737211815974801292292728082721785855274147991979220001018156560009927148374995236030383474031418802554714043680969417015155298092390680188406177667101020936206754551985229636814788735090951246816765035721775759652424641736739668936540450232814857289312589998505627375553038062765493408460941597629291231866042662108291164359496334978563287523685872262509560463225096226739991402761266388226652661345282274508037924611589455395655512013078629375186805951823181371561289129616028768733583565439798508002546685505512478002960132511531323264596144585611962969372672455541953777622436993987703564293487820434112162562492086865147598436647725445230861246093950020099084994990632102506848190196407855705745530407617253129971665939853842224965079537303198339986953399517682750248394628026225887174258267456078564070387327653989505416943226163989004419377363130466566387761757272563996086708621913140580687414698126490572618509858141748692837570235128900627675422927964369356691123905362222855545719945605604307263252851081309622569225811979426856464673233875589085773616373798857001344093594417138323005260179781153950803127773817702016534081581157881295739782000814998795398671806283018844936919299070562538763900037469485135699677248580365379125702903186174995651938469412191388327852955727869345476087173047665259892129895247785416834855450881318585909376917039');
+        var e = new JSBN.BigInteger('17');
+        var publicKey = RSA.setPublicKey(N, e);
+
+        var S = UTIL.binary.hex.decode(
+          '00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001eb90acbec1bf590ba1e50960db8381fb5bdc363d46379d09956560a616b88616ce7fa4309dc45f47f5fa47d61bf66baa3d11732ce71768ded295f962');
+
+        _checkBadTailingGarbage(publicKey, S);
+        _checkBadDigestInfo(publicKey, S, true);
+      });
+
+      it('should check DigestInfo type octet [1]', function() {
+        var publicKey = RSA.setPublicKey(N, e);
+        var S = UTIL.binary.hex.decode(
+          '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');
+
+        _checkBadDigestInfo(publicKey, S);
+      });
+
+      it('should check DigestInfo type octet [2]', function() {
+        var publicKey = RSA.setPublicKey(N, e);
+        var S = UTIL.binary.hex.decode(
+          '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');
+
+        _checkBadDigestInfo(publicKey, S);
+      });
+    });
   });
 })();

programming_language: JavaScript