CVE-2024-10963

Pam: improper hostname interpretation in pam_access leads to access control bypass

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Published Nov 7, 2024 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

To reduce the risk, administrators should ensure that no DNS hostname matches local TTY or service names used in pam_access. Additionally, implement DNSSEC to prevent spoofing of DNS responses. For stronger protection, consider reconfiguring pam_access to only accept fully qualified domain names (FQDNs) in access.conf

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-33602 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.
Ubuntu USN Ubuntu USN USN-7761-1 PAM vulnerability
History
Type Values Removed Values Added
First Time appeared Redhat rhel Els
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7		 cpe:/a:redhat:enterprise_linux:10
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat rhel Els
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:4
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:4.18::el9
References
Type Values Removed Values Added
Metrics epss

{'score': 0.00181}

 epss

{'score': 0.00185}
Type Values Removed Values Added
Metrics epss

{'score': 0.00167}

 epss

{'score': 0.00181}
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10
Type Values Removed Values Added
First Time appeared Redhat openshift Ai
CPEs cpe:/a:redhat:openshift:4 cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/a:redhat:openshift_ai:2.16::el8
cpe:/a:redhat:rhel_eus:9.4::appstream
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:8::baseos
cpe:/o:redhat:enterprise_linux:9::baseos
cpe:/o:redhat:rhel_eus:9.4::baseos
Vendors & Products Redhat openshift Ai
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:4.16::el9
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:4.17::el9
Type Values Removed Values Added
First Time appeared Redhat rhel Eus
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:rhel_eus:9.4
Vendors & Products Redhat rhel Eus
Type Values Removed Values Added
Description A vulnerability was found in pam_access due to the improper handling of tokens in access.conf, interpreted as hostnames. This flaw allows attackers to bypass access restrictions by spoofing hostnames, undermining configurations designed to limit access to specific TTYs or services. The flaw poses a risk in environments relying on these configurations for local access control. 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.
Type Values Removed Values Added
Metrics threat_severity

Moderate

 threat_severity

Important
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N'}

 cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}
Type Values Removed Values Added
Description No description is available for this CVE. A vulnerability was found in pam_access due to the improper handling of tokens in access.conf, interpreted as hostnames. This flaw allows attackers to bypass access restrictions by spoofing hostnames, undermining configurations designed to limit access to specific TTYs or services. The flaw poses a risk in environments relying on these configurations for local access control.
Title pam: Improper Hostname Interpretation in pam_access Leads to Access Control Bypass Pam: improper hostname interpretation in pam_access leads to access control bypass
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Type Values Removed Values Added
Description No description is available for this CVE.
Title pam: Improper Hostname Interpretation in pam_access Leads to Access Control Bypass
Weaknesses CWE-287
References
Metrics threat_severity

None

 cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N'}

threat_severity

Moderate
Earlier changes (12)
Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 4, 2026, 9:08 PM
Reserved
Nov 7, 2024, 7:29 AM

View source JSON

Updated
Nov 7, 2024, 6:27 PM

JSON

Status
Deferred
Published
Nov 7, 2024, 4:15 PM
Modified
Nov 4, 2026, 9:17 PM

View source JSON

Severity
Important
Public date
Nov 7, 2024, 12:00 AM

View source Bugzilla JSON

No data.