Source: libapache2-mod-auth-openidc Version: 2.4.4.1-2 Severity: important Tags: security upstream X-Debbugs-Cc: car...@debian.org, Debian Security Team <t...@security.debian.org>
Hi, The following vulnerability was published for libapache2-mod-auth-openidc. CVE-2021-32785[0]: | mod_auth_openidc is an authentication/authorization module for the | Apache 2.x HTTP server that functions as an OpenID Connect Relying | Party, authenticating users against an OpenID Connect Provider. When | mod_auth_openidc versions prior to 2.4.9 are configured to use an | unencrypted Redis cache (`OIDCCacheEncrypt off`, `OIDCSessionType | server-cache`, `OIDCCacheType redis`), `mod_auth_openidc` wrongly | performed argument interpolation before passing Redis requests to | `hiredis`, which would perform it again and lead to an uncontrolled | format string bug. Initial assessment shows that this bug does not | appear to allow gaining arbitrary code execution, but can reliably | provoke a denial of service by repeatedly crashing the Apache workers. | This bug has been corrected in version 2.4.9 by performing argument | interpolation only once, using the `hiredis` API. As a workaround, | this vulnerability can be mitigated by setting `OIDCCacheEncrypt` to | `on`, as cache keys are cryptographically hashed before use when this | option is enabled. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2021-32785 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32785 [1] https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-55r8-6w97-xxr4 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
