U.S. Dept Of Defense: [CVE-2021-29156] LDAP Injection at https://██████

Description:
https://█████ is vulnerable to CVE-2021-29156

References

• https://hackerone.com/reports/1278050
• https://nvd.nist.gov/vuln/detail/CVE-2021-29156
• https://portswigger.net/research/hidden-oauth-attack-vectors
• https://github.com/projectdiscovery/nuclei-templates/blob/74db4223c11d27a934ca1c417aa4abca9e70ad35/cves/2021/CVE-2021-29156.yaml

Impact

ForgeRock OpenAM before 13.5.1 allows LDAP injection via the Webfinger protocol. For example, an unauthenticated attacker can perform character-by-character retrieval of password hashes, or retrieve a session token or a private key.

System Host(s)

███████

Affected Product(s) and Version(s)

CVE Numbers

CVE-2021-29156

Steps to Reproduce

The references mentioned shall be helpful for successful reproduction, especially the one I reported the earlier day (#1278050) and the PortSwigger one.

• Username starting with ██████████ exists: https://█████████/███/███████[200 OK]

• Username starting with ███████ doesn’t exist: https://██████████/██████████/█████████████[404 Not Found]

For 200 OK response, it also throws out OpenAM instance address: ███

Similar thing can be done for password enumeration as well. You can find the scripts I wrote for username and password enumeration in my earlier report at a different host.

Suggested Mitigation/Remediation Actions