CVE-2020-10595
libpam-krb5 - security update
Description
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.
How to fix CVE-2020-10595
To remediate CVE-2020-10595, upgrade the affected package to a fixed version below.
- —upgrade to 4.9-1 or later
- —upgrade to 4.6-3+deb8u1 or later
- —upgrade to 4.7-4+deb9u1 or later
Is CVE-2020-10595 being exploited?
Low — EPSS is 4.8%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 4.9-1
- from 0, < 4.6-3+deb8u1
- from 0, < 4.7-4+deb9u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |