CVE-2020-26277 (published 2020-12-21T22:15Z)

DBdeployer is a tool that deploys MySQL database servers easily. In DBdeployer before version 1.58.2, users unpacking a tarball may use a maliciously packaged tarball that contains symlinks to files external to the target. In such scenario, an attacker could induce dbdeployer to write into a system file, thus altering the computer defenses. For the attack to succeed, the following factors need to contribute: 1) The user is logged in as root. While dbdeployer is usable as root, it was designed to run as unprivileged user. 2) The user has taken a tarball from a non secure source, without testing the checksum. When the tarball is retrieved through dbdeployer, the checksum is compared before attempting to unpack. This has been fixed in version 1.58.2.

Severity: MEDIUM
CVSS v2 base score: 4.0 (AV:N/AC:H/Au:N/C:N/I:P/A:P)
CVSS v3 base score: 6.1, MEDIUM (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N)

Weakness information:
cwe_id: CWE-59
cwe_name: Improper Link Resolution Before File Access ('Link Following')
description: The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
extended_description: 
            
            
         
         

Fix information:
repo_url: https://github.com/datacharmer/dbdeployer
commit_details: repo_url: https://github.com/datacharmer/dbdeployer
author: Giuseppe Maxia
author_date: 2020-12-16 19:42:30+01:00
msg: Prevent arbitrary symlinks from tarballs

If a tarball had a symlink pointing outside the extract directory,
it would be extracted without complain. Now, such a symlink will
generate an error.
repository: repo_url: https://github.com/datacharmer/dbdeployer
repo_name: datacharmer/dbdeployer
description: DBdeployer is a tool that deploys MySQL database servers easily.
repo_language: Go
owner: datacharmer
file_changes: filename: VERSION
change_type: ModificationType.MODIFY
diff: @@ -1 +1 @@
-1.58.1
+1.58.2

programming_language: SQL
filename: CHANGELOG.md
change_type: ModificationType.MODIFY
diff: @@ -1,3 +1,9 @@
+## 1.58.2	16-Dec-2020
+
+### BUGS FIXED
+
+* Prevent arbitrary symlinks from being extracted with tarballs
+
 ## 1.58.1	15-Dec-2020
 
 ### BUGS FIXED

programming_language: Markdown
filename: version.go
change_type: ModificationType.MODIFY
diff: @@ -16,9 +16,9 @@
 package common
 
 // This file was generated during build. Do not edit.
-// Build time: 2020-12-14 16:00
+// Build time: 2020-12-15 10:49
 
-var VersionDef string = "1.58.1" // 2020-12-14
+var VersionDef string = "1.58.2" // 2020-12-15
 
 // Compatible version is the version used to mark compatible archives (templates, configuration).
 // It is usually major.minor.0, except when we are at version 0.x, when

programming_language: Go
filename: go.mod
change_type: ModificationType.MODIFY
diff: @@ -8,11 +8,11 @@ require (
 	github.com/dustin/go-humanize v1.0.0
 	github.com/go-sql-driver/mysql v1.4.1
 	github.com/nightlyone/lockfile v0.0.0-20180618180623-0ad87eef1443
-	github.com/pkg/errors v0.8.1
-	github.com/spf13/cobra v1.0.0
-	github.com/spf13/pflag v1.0.3
+	github.com/pkg/errors v0.9.1
+	github.com/spf13/cobra v1.1.1
+	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.4.0 // indirect
 	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8
-	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
-	golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b // indirect
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
+	golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 // indirect
 )

programming_language: Go
filename: go.sum
change_type: ModificationType.MODIFY
diff: @@ -1,6 +1,19 @@
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@@ -8,14 +21,18 @@ github.com/alexeyco/simpletable v0.0.0-20180729223640-1fa9009f1080 h1:LxG2QAVrS0
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@@ -27,8 +44,10 @@ github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZm
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@@ -40,19 +59,53 @@ github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zV
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programming_language: Go
filename: unpack.go
change_type: ModificationType.MODIFY
diff: @@ -57,14 +57,16 @@ import (
 	"io"
 	"os"
 	"path"
+	"path/filepath"
 	"regexp"
 	"strconv"
 	"strings"
 
-	"github.com/datacharmer/dbdeployer/common"
-	"github.com/datacharmer/dbdeployer/globals"
 	"github.com/pkg/errors"
 	"github.com/xi2/xz"
+
+	"github.com/datacharmer/dbdeployer/common"
+	"github.com/datacharmer/dbdeployer/globals"
 )
 
 const (
@@ -123,7 +125,7 @@ func UnpackXzTar(filename string, destination string, verbosityLevel int) (err e
 	}
 	// Create a tar Reader
 	tr := tar.NewReader(r)
-	return unpackTarFiles(tr)
+	return unpackTarFiles(tr, destination)
 }
 
 func UnpackTar(filename string, destination string, verbosityLevel int) (err error) {
@@ -163,10 +165,15 @@ func UnpackTar(filename string, destination string, verbosityLevel int) (err err
 	} else {
 		reader = tar.NewReader(fileReader)
 	}
-	return unpackTarFiles(reader)
+	return unpackTarFiles(reader, destination)
 }
 
-func unpackTarFiles(reader *tar.Reader) (err error) {
+func unpackTarFiles(reader *tar.Reader, extractDir string) error {
+	const errLinkedDirectoryOutside = "linked directory '%s' is outside the extraction directory"
+	extractAbsDir, err := filepath.Abs(extractDir)
+	if err != nil {
+		return fmt.Errorf("error defining the absolute path of '%s': %s", extractDir, err)
+	}
 	var header *tar.Header
 	var count int = 0
 	var reSlash = regexp.MustCompile(`/.*`)
@@ -267,6 +274,27 @@ func unpackTarFiles(reader *tar.Reader) (err error) {
 			}
 		case tar.TypeSymlink:
 			if header.Linkname != "" {
+				linkDepth := pathDepth(header.Linkname)
+				nameDepth := pathDepth(header.Name)
+				if linkDepth > nameDepth {
+					fmt.Println()
+					return fmt.Errorf(errLinkedDirectoryOutside, header.Linkname)
+				}
+				if common.FileExists(header.Linkname) {
+					absFile, err := filepath.Abs(header.Linkname)
+					if err != nil {
+						return fmt.Errorf("error retrieving absolute path of %s: %s", header.Linkname, err)
+					}
+					if !common.BeginsWith(absFile, extractAbsDir) {
+						return fmt.Errorf(errLinkedDirectoryOutside, header.Linkname)
+					}
+				} else {
+					if common.BeginsWith(header.Linkname, "/") {
+						if !common.BeginsWith(header.Linkname, extractAbsDir) {
+							return fmt.Errorf(errLinkedDirectoryOutside, header.Linkname)
+						}
+					}
+				}
 				condPrint(fmt.Sprintf("%s -> %s", filename, header.Linkname), true, CHATTY)
 				err = os.Symlink(header.Linkname, filename)
 				if err != nil {
@@ -280,6 +308,12 @@ func unpackTarFiles(reader *tar.Reader) (err error) {
 	// return nil
 }
 
+func pathDepth(s string) int {
+	reSlash := regexp.MustCompilePOSIX("(/)")
+	list := reSlash.FindAllStringIndex(s, -1)
+	return len(list)
+}
+
 func unpackTarFile(filename string,
 	reader *tar.Reader) (err error) {
 	var writer *os.File

programming_language: Go