CVE-2022-24851 (published 2022-04-15T19:15Z)

LDAP Account Manager (LAM) is an open source web frontend for managing entries stored in an LDAP directory. The profile editor tool has an edit profile functionality, the parameters on this page are not properly sanitized and hence leads to stored XSS attacks. An authenticated user can store XSS payloads in the profiles, which gets triggered when any other user try to access the edit profile page. The pdf editor tool has an edit pdf profile functionality, the logoFile parameter in it is not properly sanitized and an user can enter relative paths like ../../../../../../../../../../../../../usr/share/icons/hicolor/48x48/apps/gvim.png via tools like burpsuite. Later when a pdf is exported using the edited profile the pdf icon has the image on that path(if image is present). Both issues require an attacker to be able to login to LAM admin interface. The issue is fixed in version 7.9.1.

Severity: LOW
CVSS v2 base score: 3.5 (AV:N/AC:M/Au:S/C:N/I:P/A:N)
CVSS v3 base score: 4.8, MEDIUM (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N)

Weakness information:
cwe_id: CWE-79
cwe_name: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
description: The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
extended_description: 
            Cross-site scripting (XSS) vulnerabilities occur when:
            
               Untrusted data enters a web application, typically from a web request.
               The web application dynamically generates a web page that contains this untrusted data.
               During page generation, the application does not prevent the data from containing content that is executable by a web browser, such as JavaScript, HTML tags, HTML attributes, mouse events, Flash, ActiveX, etc.
               A victim visits the generated web page through a web browser, which contains malicious script that was injected using the untrusted data.
               Since the script comes from a web page that was sent by the web server, the victim's web browser executes the malicious script in the context of the web server's domain.
               This effectively violates the intention of the web browser's same-origin policy, which states that scripts in one domain should not be able to access resources or run code in a different domain.
            
            There are three main kinds of XSS:
            
               
                  Type 1: Reflected XSS (or Non-Persistent) - 
         			The server reads data directly from the HTTP request and reflects it back in the HTTP response. Reflected XSS exploits occur when an attacker causes a victim to supply dangerous content to a vulnerable web application, which is then reflected back to the victim and executed by the web browser. The most common mechanism for delivering malicious content is to include it as a parameter in a URL that is posted publicly or e-mailed directly to the victim. URLs constructed in this manner constitute the core of many phishing schemes, whereby an attacker convinces a victim to visit a URL that refers to a vulnerable site. After the site reflects the attacker's content back to the victim, the content is executed by the victim's browser.
               
                  Type 2: Stored XSS (or Persistent) - 
               The application stores dangerous data in a database, message forum, visitor log, or other trusted data store. At a later time, the dangerous data is subsequently read back into the application and included in dynamic content. From an attacker's perspective, the optimal place to inject malicious content is in an area that is displayed to either many users or particularly interesting users. Interesting users typically have elevated privileges in the application or interact with sensitive data that is valuable to the attacker. If one of these users executes malicious content, the attacker may be able to perform privileged operations on behalf of the user or gain access to sensitive data belonging to the user. For example, the attacker might inject XSS into a log message, which might not be handled properly when an administrator views the logs.
            
               
                  Type 0: DOM-Based XSS - 
               In DOM-based XSS, the client performs the injection of XSS into the page; in the other types, the server performs the injection. DOM-based XSS generally involves server-controlled, trusted script that is sent to the client, such as Javascript that performs sanity checks on a form before the user submits it. If the server-supplied script processes user-supplied data and then injects it back into the web page (such as with dynamic HTML), then DOM-based XSS is possible.
            
            
            Once the malicious script is injected, the attacker can perform a variety of malicious activities. The attacker could transfer private information, such as cookies that may include session information, from the victim's machine to the attacker. The attacker could send malicious requests to a web site on behalf of the victim, which could be especially dangerous to the site if the victim has administrator privileges to manage that site. Phishing attacks could be used to emulate trusted web sites and trick the victim into entering a password, allowing the attacker to compromise the victim's account on that web site. Finally, the script could exploit a vulnerability in the web browser itself possibly taking over the victim's machine, sometimes referred to as "drive-by hacking."
            In many cases, the attack can be launched without the victim even being aware of it. Even with careful users, attackers frequently use a variety of methods to encode the malicious portion of the attack, such as URL encoding or Unicode, so the request looks less suspicious.
         
         

Fix information:
repo_url: https://github.com/LDAPAccountManager/lam
commit_details: repo_url: https://github.com/LDAPAccountManager/lam
author: Roland Gruber
author_date: 2022-04-11 20:40:13+02:00
msg: #170 fixed security issues in profile editor and PDF editor
repository: repo_url: https://github.com/LDAPAccountManager/lam
repo_name: LDAPAccountManager/lam
description: LDAP Account Manager
repo_language: PHP
owner: LDAPAccountManager
file_changes: filename: HISTORY
change_type: ModificationType.MODIFY
diff: @@ -2,6 +2,7 @@ June 2022 8.0
   - Extended user account status and locking options
   - Fixed bugs:
    -> Hidden account is displayed (257)
+   -> Security issues in PDF editor and profile editor
 
 09.03.2022 7.9
   - Tree view:

programming_language: Markdown
filename: html.inc
change_type: ModificationType.MODIFY
diff: @@ -558,10 +558,10 @@ class htmlInputField extends htmlElement {
 		}
 		if (isset($values[$this->fieldName])) {
 			if (isObfuscatedText($values[$this->fieldName][0])) {
-				$this->fieldValue = deobfuscateText($values[$this->fieldName][0]);
+				$this->fieldValue = htmlspecialchars(deobfuscateText($values[$this->fieldName][0]));
 			}
 			else {
-				$this->fieldValue = $values[$this->fieldName][0];
+				$this->fieldValue = htmlspecialchars($values[$this->fieldName][0]);
 			}
 		}
 		$validators = array();

programming_language: PHP
filename: pdfpage.php
change_type: ModificationType.MODIFY
diff: @@ -13,6 +13,7 @@ use \htmlSubTitle;
 use \htmlResponsiveInputTextarea;
 use \htmlHiddenInput;
 use \htmlSpacer;
+use LAM\PDF\PdfLogo;
 use LAM\PDF\PdfStructurePersistenceManager;
 use LAM\PDF\PDFTextSection;
 use LAM\PDF\PDFEntrySection;
@@ -23,7 +24,7 @@ use LAMException;
 /*
   This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
   Copyright (C) 2003 - 2006  Michael Duergner
-                2007 - 2021  Roland Gruber
+                2007 - 2022  Roland Gruber
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -132,8 +133,9 @@ if (!isset($_SESSION['currentPDFStructure'])) {
 	}
 }
 
+$logoFiles = $pdfStructurePersistenceManager->getPdfLogos($_SESSION['config']->getName(), true);
 if (!empty($_POST['form_submit'])) {
-	updateBasicSettings($_SESSION['currentPDFStructure']);
+	updateBasicSettings($_SESSION['currentPDFStructure'], $logoFiles);
 	updateSectionTitles($_SESSION['currentPDFStructure']);
 	addSection($_SESSION['currentPDFStructure']);
 	addSectionEntry($_SESSION['currentPDFStructure']);
@@ -228,7 +230,6 @@ else if (isset($_POST['pdfname'])) {
 // headline
 $headline = $_SESSION['currentPDFStructure']->getTitle();
 // logo
-$logoFiles = $pdfStructurePersistenceManager->getPdfLogos($_SESSION['config']->getName(), true);
 $logos = array(_('No logo') => 'none');
 foreach($logoFiles as $logoFile) {
 	$logos[$logoFile->getName() . ' (' . $logoFile->getWidth() . ' x ' . $logoFile->getHeight() . ")"] = $logoFile->getName();
@@ -516,16 +517,28 @@ function translateFieldIDToName($id, $scope, $availablePDFFields) {
 /**
  * Updates basic settings such as logo and head line.
  *
- * @param PDFStructure $structure
+ * @param PDFStructure $structure PDF structure
+ * @param PdfLogo[] $logoFiles logos
  */
-function updateBasicSettings(PDFStructure &$structure) {
+function updateBasicSettings(PDFStructure &$structure, array $logoFiles) {
 	// set headline
 	if (isset($_POST['headline'])) {
 		$structure->setTitle(str_replace('<', '', str_replace('>', '', $_POST['headline'])));
 	}
 	// set logo
 	if (isset($_POST['logoFile'])) {
-		$structure->setLogo($_POST['logoFile']);
+	    $fileName = $_POST['logoFile'];
+	    $found = false;
+	    foreach ($logoFiles as $logoFile) {
+	        if ($logoFile->getName() === $fileName) {
+	            $found = true;
+            }
+        }
+	    if (!$found) {
+	        logNewMessage(LOG_ERR, 'Invalid PDF logo file: ' . $fileName);
+	        return;
+        }
+		$structure->setLogo($fileName);
 	}
 	// set folding marks
 	if (isset($_POST['foldingmarks'])) {

programming_language: PHP