Information disclosure in linux-pam - CVE-2015-3238
Published: August 24, 2015 / Updated: July 28, 2020
Vulnerability identifier: #VU32409
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2015-3238
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: git.kernel.org
Affected software:
linux-pam
linux-pam
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.
The _unix_run_helper_binary function in the pam_unix module in Linux-PAM (aka pam) before 1.2.1, when unable to directly access passwords, allows local users to enumerate usernames or cause a denial of service (hang) via a large password.
How to mitigate CVE-2015-3238
Install update from vendor's website.
Sources
- http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161350.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/161249.html
- http://rhn.redhat.com/errata/RHSA-2015-1640.html
- http://www.openwall.com/lists/oss-security/2015/06/25/13
- http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
- http://www.securityfocus.com/bid/75428
- http://www.ubuntu.com/usn/USN-2935-1
- http://www.ubuntu.com/usn/USN-2935-2
- http://www.ubuntu.com/usn/USN-2935-3
- https://bugzilla.redhat.com/show_bug.cgi?id=1228571
- https://security.gentoo.org/glsa/201605-05
- https://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-011/?fid=6551
- https://www.trustwave.com/Resources/SpiderLabs-Blog/Username-Enumeration-against-OpenSSH-SELinux-with-CVE-2015-3238/