pam-krb5 up to 4.8 Kerberos buffer overflow

Summaryinfo

A vulnerability described as critical has been identified in pam-krb5 up to 4.8. This impacts an unknown function of the component Kerberos Handler. Executing a manipulation can lead to buffer overflow. This vulnerability appears as CVE-2020-10595. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in pam-krb5 up to 4.8. It has been declared as critical. This vulnerability affects an unknown code block of the component Kerberos Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was presented 03/31/2020 (Website). The advisory is available at debian.org. This vulnerability was named CVE-2020-10595 since 03/16/2020. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 4.9 eliminates this vulnerability.

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Productinfo

Name

• pam-krb5

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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