CVE-2023-28857
Apereo CAS LDAP Certificate Revoction Password Leak
Description
Apereo CAS is an open source multilingual single sign-on solution for the web. Apereo CAS can be configured to use authentication based on client X509 certificates. These certificates can be provided via TLS handshake or a special HTTP header, such as “ssl_client_cert”. When checking the validity of the provided client certificate, X509CredentialsAuthenticationHandler performs check that this certificate is not revoked. To do so, it fetches URLs provided in the “CRL Distribution Points” extension of the certificate, which are taken from the certificate itself and therefore can be controlled by a malicious user. If the CAS server is configured to use an LDAP server for x509 authentication with a password, for example by setting a “cas.authn.x509.ldap.ldap-url” and “cas.authn.x509.ldap.bind-credential” properties, X509CredentialsAuthenticationHandler fetches revocation URLs from the certificate, which can be LDAP urls. When making requests to this LDAP urls, Apereo CAS uses the same password as for initially configured LDAP server, which can lead to a password leak. An unauthenticated user can leak the password used to LDAP connection configured on server. This issue has been addressed in version 6.6.6. Users are advised to upgrade. There are no known workarounds for this vulnerability.
INFO
Published Date :
June 27, 2023, 6:15 p.m.
Last Modified :
July 6, 2023, 6:11 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-28857.
| URL | Resource |
|---|---|
| https://apereo.github.io/2023/02/20/x509-vuln/ | Third Party Advisory |
| https://github.com/apereo/cas/releases/tag/v6.6.6 | Release Notes |
| https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/ | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-28857 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-28857 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jul. 06, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Changed Reference Type https://apereo.github.io/2023/02/20/x509-vuln/ No Types Assigned https://apereo.github.io/2023/02/20/x509-vuln/ Third Party Advisory Changed Reference Type https://github.com/apereo/cas/releases/tag/v6.6.6 No Types Assigned https://github.com/apereo/cas/releases/tag/v6.6.6 Release Notes Changed Reference Type https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/ No Types Assigned https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/ Third Party Advisory Added CWE NIST CWE-522 Added CPE Configuration OR *cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:* versions from (including) 6.5.0 up to (excluding) 6.5.9.1 *cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:* versions from (including) 6.6.0 up to (excluding) 6.6.6
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-28857 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-28857
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.11 }} 0.01%
score
0.45037
percentile