SARA / Free Tools / CVE / CVE-2023-28857

CVE-2023-28857 — Apereo CAS is an open source multilingual single sign-on solution for the web

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 chec

CVSS
4.0 MEDIUM
EPSS
0.18% (top 60.30%)
CWE
CWE-200
Published
2023-06-27T17:10:47.930Z
Last modified
2024-11-27T19:03:39.948Z
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

01What is this vulnerability?

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…

02Affected products

VendorProductVersions
ApereoCAS>= 6.5.0, < 6.5.9.1, >= 6.6.0, < 6.6.6

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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