CVE-2020-10595

Published: 31 March 2020

pam-krb5 before 4.9 has a buffer overflow that might cause remote code execution in situations involving supplemental prompting by a Kerberos library. It may overflow a buffer provided by the underlying Kerberos library by a single '\0' byte if an attacker responds to a prompt with an answer of a carefully chosen length. The effect may range 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 is not used for normal authentication, but only when the Kerberos library does supplemental prompting, such as with PKINIT or when using the non-standard no_prompt PAM configuration option.

Priority

Medium

CVSS 3 base score: 9.8

Status

Package Release Status
libpam-krb5
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 20.04 LTS (Focal Fossa)
Released (4.8-2ubuntu1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.8-1ubuntu0.1)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.7-2ubuntu0.1)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.6-2ubuntu0.1~esm1)
Ubuntu 12.04 ESM (Precise Pangolin)
Released (4.5-3ubuntu0.1)