A vulnerability, which was classified as critical, was found in FreeBSD up to 2.1.6.1 (Operating System). This affects an unknown functionality of the component ppp. The manipulation of the argument HOME as part of a Environment Variable leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

buffer overflow in ppp program in freebsd 2.1 and earlier allows local users to gain privileges via a long home environment variable.

The weakness was released 12/19/1996 as FreeBSD-SA-96:20 as not defined advisory (Website). It is possible to read the advisory at ftp.freebsd.org. This vulnerability is uniquely identified as CVE-1999-1385. The exploitability is told to be easy. Attacking locally is a requirement. No form of authentication is needed for exploitation. Technical details and a exploit are known.

After immediately, there has been an exploit disclosed. It is declared as proof-of-concept. The exploit is shared for download at archives.neohapsis.com. We expect the 0-day to have been worth approximately $5k-$25k.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (7465) and Vulnerability Center (SBV-23331).

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• Operating System

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• FreeBSD

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• open-source

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