CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
AI Score
Confidence
High
EPSS
Percentile
81.3%
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.
[
{
"vendor": "zmartzone",
"product": "mod_auth_openidc",
"versions": [
{
"version": "< 2.4.9",
"status": "affected"
}
]
}
]
github.com/zmartzone/mod_auth_openidc/commit/dc672688dc1f2db7df8ad4abebc367116017a449
github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9
github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-55r8-6w97-xxr4
lists.debian.org/debian-lts-announce/2023/04/msg00034.html
security.netapp.com/advisory/ntap-20210902-0001/
www.oracle.com/security-alerts/cpuapr2022.html
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
AI Score
Confidence
High
EPSS
Percentile
81.3%