CVE-2024-10963

Publication date 7 November 2024

Last updated 23 September 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.4 · High

Score breakdown

Description

A flaw was found in pam_access, where certain rules in its configuration file are mistakenly treated as hostnames. This vulnerability allows attackers to trick the system by pretending to be a trusted hostname, gaining unauthorized access. This issue poses a risk for systems that rely on this feature to control who can access certain services or terminals.

Read the notes from the security team

Status

Package Ubuntu Release Status
pam 25.04 plucky
Fixed 1.5.3-7ubuntu4.4
24.10 oracular Ignored end of life, was needed
24.04 LTS noble
Fixed 1.5.3-5ubuntu5.5
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

mdeslaur

Introduced in 1.5.3 by https://github.com/linux-pam/linux-pam/pull/447 The fix below simply introduces a new option called "nodns" that reverts behaviour to pre 1.5.3 and will safely allow tty/service names in access.conf

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
pam

Severity score breakdown

Parameter Value
Base score 7.4 · High
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Related Ubuntu Security Notices (USN)

Other references