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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-32785 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/zmartzone/mod_auth_openidc/commit/dc672688dc1f2db7df8ad4abebc367116017a449 CVE, GitHub, Inc. Patch  Third Party Advisory 
https://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9 CVE, GitHub, Inc. Release Notes  Third Party Advisory 
https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-55r8-6w97-xxr4 CVE, GitHub, Inc. Mitigation  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html CVE, GitHub, Inc. Mailing List  Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210902-0001/ CVE, GitHub, Inc. Third Party Advisory 
https://www.oracle.com/security-alerts/cpuapr2022.html CVE, GitHub, Inc. Patch  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-134 Use of Externally-Controlled Format String cwe source acceptance level NIST   GitHub, Inc.  

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Change History

10 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-32785
NVD Published Date:
07/22/2021
NVD Last Modified:
11/21/2024
Source:
GitHub, Inc.