Vulnerability · Published Mar 31, 2020 · Assigned by mitre
CVE-2020-10595
Critical 9.8
In plain English
A critical-severity security flaw in the libpam-krb5 package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.8% (higher than 92% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libpam-krb5 | 4.9-1 | DEBIAN-CVE-2020-10595 |
| Debian:13 | libpam-krb5 | 4.9-1 | DEBIAN-CVE-2020-10595 |
| Debian:14 | libpam-krb5 | 4.9-1 | DEBIAN-CVE-2020-10595 |
Affected products (as reported)
References
- https://github.com/rra/pam-krb5/commit/e7879e27a37119fad4faf133a9f70bdcdc75d760 x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2020/03/31/1 x_refsource_CONFIRM
- DSA-4648 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20200401 [SECURITY] [DLA 2166-1] libpam-krb5 security update mailing-list, x_refsource_MLIST
- USN-4314-1 vendor-advisory, x_refsource_UBUNTU
- https://www.eyrie.org/~eagle/software/pam-krb5/security/2020-03-30.html x_refsource_MISC