CVE-2022-39369— Apereo CAS 安全漏洞
一分钟漏洞结论
影响对象
apereo phpCAS
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 1.6.0之前版本存在安全漏洞，该漏洞源于允许PHP应用程序通过中央身份验证服务（CAS）轻松对用户进行身份验证。
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一、 漏洞 CVE-2022-39369 基础信息
漏洞信息
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Vulnerability Title
Service Hostname Discovery Exploitation in phpCAS
来源: CVE Program / CVE List V5
Vulnerability Description
phpCAS is an authentication library that allows PHP applications to easily authenticate users via a Central Authentication Service (CAS) server. The phpCAS library uses HTTP headers to determine the service URL used to validate tickets. This allows an attacker to control the host header and use a valid ticket granted for any authorized service in the same SSO realm (CAS server) to authenticate to the service protected by phpCAS. Depending on the settings of the CAS server service registry in worst case this may be any other service URL (if the allowed URLs are configured to "^(https)://.*") or may be strictly limited to known and authorized services in the same SSO federation if proper URL service validation is applied. This vulnerability may allow an attacker to gain access to a victim's account on a vulnerable CASified service without victim's knowledge, when the victim visits attacker's website while being logged in to the same CAS server. phpCAS 1.6.0 is a major version upgrade that starts enforcing service URL discovery validation, because there is unfortunately no 100% safe default config to use in PHP. Starting this version, it is required to pass in an additional service base URL argument when constructing the client class. For more information, please refer to the upgrading doc. This vulnerability only impacts the CAS client that the phpCAS library protects against. The problematic service URL discovery behavior in phpCAS < 1.6.0 will only be disabled, and thus you are not impacted from it, if the phpCAS configuration has the following setup: 1. `phpCAS::setUrl()` is called (a reminder that you have to pass in the full URL of the current page, rather than your service base URL), and 2. `phpCAS::setCallbackURL()` is called, only when the proxy mode is enabled. 3. If your PHP's HTTP header input `X-Forwarded-Host`, `X-Forwarded-Server`, `Host`, `X-Forwarded-Proto`, `X-Forwarded-Protocol` is sanitized before reaching PHP (by a reverse proxy, for example), you will not be impacted by this vulnerability either. If your CAS server service registry is configured to only allow known and trusted service URLs the severity of the vulnerability is reduced substantially in its severity since an attacker must be in control of another authorized service. Otherwise, you should upgrade the library to get the safe service discovery behavior.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
对资源描述符的控制不恰当(资源注入)
来源: CVE Program / CVE List V5
Vulnerability Title
Apereo CAS 安全漏洞
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 1.6.0之前版本存在安全漏洞，该漏洞源于允许PHP应用程序通过中央身份验证服务（CAS）轻松对用户进行身份验证。
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-2022-39369 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2022-39369 厂商安全公告 (1)
CVE-2022-39369 邮件列表归档 (3)
IV. Related Vulnerabilities
Same product: phpCAS
V. Comments for CVE-2022-39369
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