A vulnerability classified as critical was found in FreeBSD up to 4.4 (Operating System). This vulnerability affects the function getlogin of the file k5su of the component Kerberos5. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Kerberos 5 su (k5su) in FreeBSD 4.4 and earlier relies on the getlogin system call to determine if the user running k5su is root, which could allow a root-initiated process to regain its privileges after it has dropped them.

The weakness was published 08/12/2002 by lumpy (Website). The advisory is shared for download at ftp.freebsd.org. This vulnerability was named CVE-2002-0754. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/08/2018). The MITRE ATT&CK project declares the attack technique as T1068.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entry is available at 18641.

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Type

• Operating System

Name

• FreeBSD

Version

• 0.4e
• 4.0
• 4.1
• 4.1.1
• 4.2
• 4.3
• 4.4

License

• open-source

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