Detections
Analytics

SCA: security update for apereo/phpcas (GHSA-8q72-6qq8-xv64)

high Tenable Self-Hosted Container Security Plugin ID 412803

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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.
 (CVE-2022-39369)

See Also

https://github.com/advisories/GHSA-8q72-6qq8-xv64

Plugin Details

Severity: High

ID: 412803

Version: Revision 1.17

Type: Local

Family: SCA Checks

Published: 1/23/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2022-39369

CVSS v3

Risk Factor: High

Base Score: 8

Temporal Score: 7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 11/1/2022

Vulnerability Publication Date: 11/1/2022

Reference Information

CVE: CVE-2022-39369