CVE-2021-32785

CVSS V2 Medium 4.3 CVSS V3 High 7.5
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.
Overview
  • CVE ID
  • CVE-2021-32785
  • Assigner
  • security-advisories@github.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-07-22T22:15:08
  • Last Modified Date
  • 2022-05-10T18:02:39
Weakness Enumerations
CWE URL
CWE-134 http://cwe.mitre.org/data/definitions/134.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:a:zmartzone:mod_auth_openidc:*:*:*:*:*:*:*:* 1 OR 2.4.9
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* 0 OR 2.0.0 2.4.48
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:M/Au:N/C:N/I:N/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • PARTIAL
  • Base Score
  • 4.3
  • Severity
  • MEDIUM
  • Exploitability Score
  • 8.6
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 7.5
  • Base Severity
  • HIGH
  • Exploitability Score
  • 3.9
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-55r8-6w97-xxr4 Mitigation Third Party Advisory
https://github.com/zmartzone/mod_auth_openidc/commit/dc672688dc1f2db7df8ad4abebc367116017a449 Patch Third Party Advisory
https://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9 Release Notes Third Party Advisory
https://security.netapp.com/advisory/ntap-20210902-0001/ Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-32785
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32785
History
Created Old Value New Value Data Type Notes
2022-04-20 16:59:11 Added to TrackCVE
2022-12-05 06:51:14 2021-07-22T22:15Z 2021-07-22T22:15:08 CVE Published Date updated
2022-12-05 06:51:14 2022-05-10T18:02:39 CVE Modified Date updated
2022-12-05 06:51:14 Analyzed Vulnerability Status updated