CVE-2023-28857— Apereo CAS 信息泄露漏洞
一分钟漏洞结论
影响对象
Apereo CAS
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Apereo CAS是一套基于Web的企业多语言单点登录解决方案。 Apereo CAS存在信息泄露漏洞，该漏洞源于存在LDAP身份验证凭据泄露问题。
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一、 漏洞 CVE-2023-28857 基础信息
漏洞信息
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Vulnerability Title
LDAP password leak in Apereo CAS - GHSL-2023-009
来源: CVE Program / CVE List V5
Vulnerability 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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
信息暴露
来源: CVE Program / CVE List V5
Vulnerability Title
Apereo CAS 信息泄露漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Apereo CAS是一套基于Web的企业多语言单点登录解决方案。 Apereo CAS存在信息泄露漏洞，该漏洞源于存在LDAP身份验证凭据泄露问题。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2023-28857 的公开POC
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CVE-2023-28857 安全博客文章 (1)
CVE-2023-28857 其他参考 (2)
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https://github.com/apereo/cas/releases/tag/v6.6.6 x_refsource_MISC
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https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/ x_refsource_CONFIRM
IV. Related Vulnerabilities
V. Comments for CVE-2023-28857
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