CVE-2021-41232 – CVE-2021-41232 is an LDAP injection vulnerabili... (How to Fix)

Q: What is the severity of CVE-2021-41232?

CVE-2021-41232 has a CVSS score of 8.1 (HIGH). CVE-2021-41232 is an LDAP injection vulnerability in Thunderdome planning poker tool that allows attackers to manipulate LDAP queries when LDAP authentication is enabled. This affects all Thunderdome instances with LDAP authentication configured. Attackers could potentially bypass authentication or extract sensitive information from LDAP directories.

📋 TL;DR

CVE-2021-41232 is an LDAP injection vulnerability in Thunderdome planning poker tool that allows attackers to manipulate LDAP queries when LDAP authentication is enabled. This affects all Thunderdome instances with LDAP authentication configured. Attackers could potentially bypass authentication or extract sensitive information from LDAP directories.

💻 Affected Systems

Products:

Thunderdome Planning Poker

Versions: All versions before 1.16.3

Operating Systems: All platforms running Thunderdome

Default Config Vulnerable: ✅ No

Notes: Only vulnerable when LDAP authentication feature is explicitly enabled and configured.

📦 What is this software?

Planning Poker by Thunderdome

View all CVEs affecting Planning Poker →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete LDAP directory compromise allowing extraction of all user credentials, privilege escalation, and potential lateral movement to connected systems.

🟠

Likely Case

Authentication bypass allowing unauthorized access to Thunderdome application, potential extraction of limited LDAP user data.

🟢

If Mitigated

No impact if LDAP authentication is disabled or proper input validation is implemented.

🌐 Internet-Facing: HIGH - Internet-facing instances with LDAP authentication are directly exploitable by remote attackers.

🏢 Internal Only: MEDIUM - Internal instances still vulnerable but require network access; risk depends on attacker position within network.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

LDAP injection vulnerabilities are well-understood attack vectors with readily available exploitation techniques.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.16.3

Vendor Advisory: https://github.com/StevenWeathers/thunderdome-planning-poker/security/advisories/GHSA-26cm-qrc6-mfgj

Restart Required: Yes

Instructions:

1. Backup current configuration. 2. Update to version 1.16.3 or later. 3. Restart Thunderdome service. 4. Verify LDAP authentication still works correctly.

🔧 Temporary Workarounds

Disable LDAP Authentication

all

Temporarily disable LDAP authentication feature until patching can be completed

Modify Thunderdome configuration to use alternative authentication method or disable authentication entirely

🧯 If You Can't Patch

Disable LDAP authentication feature immediately
Implement network segmentation to isolate Thunderdome instances from LDAP servers

🔍 How to Verify

Check if Vulnerable:

Check Thunderdome version and LDAP configuration. If version < 1.16.3 and LDAP authentication is enabled, system is vulnerable.

Check Version:

Check Thunderdome web interface or configuration files for version information

Verify Fix Applied:

Verify Thunderdome version is 1.16.3 or later and test LDAP authentication functionality.

📡 Detection & Monitoring

Log Indicators:

Unusual LDAP query patterns in Thunderdome logs
Failed authentication attempts with special characters in username field
Unexpected LDAP bind operations

Network Indicators:

Unusual LDAP traffic from Thunderdome servers
Multiple authentication attempts with varying usernames containing special characters

SIEM Query:

source="thunderdome" AND (username CONTAINS "*" OR username CONTAINS "(" OR username CONTAINS ")")

📊 Metadata

CVE ID: CVE-2021-41232

CVSS v3 Score: 8.1 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L

CWE: CWE-74

Published: November 2, 2021

Last Updated: November 21, 2024

🔗 References

https://github.com/StevenWeathers/thunderdome-planning-poker/commit/f1524d01e8a0f2d6c3db5461c742456c692dd8c1 Patch
https://github.com/StevenWeathers/thunderdome-planning-poker/security/advisories/GHSA-26cm-qrc6-mfgj Third Party Advisory
https://github.com/github/securitylab/issues/464#issuecomment-957094994 Issue Tracking,Third Party Advisory
https://github.com/StevenWeathers/thunderdome-planning-poker/commit/f1524d01e8a0f2d6c3db5461c742456c692dd8c1 Patch
https://github.com/StevenWeathers/thunderdome-planning-poker/security/advisories/GHSA-26cm-qrc6-mfgj Third Party Advisory
https://github.com/github/securitylab/issues/464#issuecomment-957094994 Issue Tracking,Third Party Advisory

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