libapache2-mod-auth-openidc: CVE-2021-32785

Debian Bug report logs - #991583
libapache2-mod-auth-openidc: CVE-2021-32785

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: libapache2-mod-auth-openidc: CVE-2021-32785

Date: Tue, 27 Jul 2021 22:07:05 +0200

Source: libapache2-mod-auth-openidc
Version: 2.4.4.1-2
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@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

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