Title: FreeBSD fts Library Buffer Overflow Vulnerability
Severity: MODERATE
Description:
Within Libc and in particular in the fts library functions a buffer overflow exists in certain FreeBS installations. The fts routines are used by programs which need to traverse the files system of the host. Any series of startup scripts which do work within the file system may use fts. However, this particular overflow is related to the security checking scripts. The fts library functions had a buffer overflow m which would lead to a core dump when periodic ran the security checking scripts (or other scripts which traverse trees that can be controlled by users). periodic(3) should limit core size to zero to disable core dumps while it is executing commands, but does not do so. In addition, the kernel should not follow symbolic links. All three of these problems caused a situation where it was possible for an attacker could create or overwrite an arbitrary file on the system with a moderate degree of control of its contents to cause a problem. The vast majority of this description was taken from the FreeBSD Advisory FreeBSD-SA-99:05 which is available in its entirety in the 'credits' section of this vulnerability entry.
Affected Products:
- FreeBSD FreeBSD 1.1.5 .1
- FreeBSD FreeBSD 2.0.0
- FreeBSD FreeBSD 2.0.5
- FreeBSD FreeBSD 2.1.0
- FreeBSD FreeBSD 2.1.5
- FreeBSD FreeBSD 2.1.7 .1
- FreeBSD FreeBSD 2.2.2
- FreeBSD FreeBSD 2.2.3
- FreeBSD FreeBSD 2.2.4
- FreeBSD FreeBSD 2.2.5
- FreeBSD FreeBSD 2.2.6
- FreeBSD FreeBSD 2.2.8
- FreeBSD FreeBSD 3.0.0
- FreeBSD FreeBSD 3.1.0
- FreeBSD FreeBSD 3.2.0
References:
- FreeBSD: FreeBSD Security Information
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