Debian LTS: Security Advisory for libpam-krb5 (DLA-2166-1)

Published: 2020-04-02 03:00:05
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:P/I:P/A:P

Summary:
The remote host is missing an update for the 'libpam-krb5' Linux Distribution Package(s) announced via the DLA-2166-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
The krb5 PAM module (pam_krb5.so) had a buffer overflow that might have caused remote code execution in situations involving supplemental prompting by a Kerberos library. It might have overflown a buffer provided by the underlying Kerberos library by a single '\0' byte if an attacker responded to a prompt with an answer of a carefully chosen length. The effect may have ranged from heap corruption to stack corruption depending on the structure of the underlying Kerberos library, with unknown effects but possibly including code execution. This code path had not been used for normal authentication, but only when the Kerberos library did supplemental prompting, such as with PKINIT or when using the non-standard no_prompt PAM configuration option.

Affected Versions:
'libpam-krb5' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 8 'Jessie', this problem has been fixed in version 4.6-3+deb8u1. The fix was prepared by Mike Gabriel. We recommend that you upgrade your libpam-krb5 Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2020-10595

References:

https://lists.debian.org/debian-lts-announce/2020/04/msg00000.html
https://security-tracker.debian.org/tracker/DLA-2166-1

Severity
High
CVSS Score
7.5
Published
2020-04-02
Modified
2020-04-02
Category
Debian Local Security Checks

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