Secunia

Karol Wiesek has reported four vulnerabilities in Fcron, which can be exploited by malicious, local users to gain knowledge of sensitive information, bypass access restrictions, and delete arbitrary files.

1) A design error in the fcronsighup utility, which runs setuid root, can be exploited to read the content of arbitrary files on the system by passing them as a command line argument.

2) A design error in the fcronsighup utility can be exploited to bypass access restrictions by passing e.g. "/proc/self/cmdline" or "/proc/self/environ" as command line argument. This makes it possible for the user to supply arbitrary configuration settings.

3) An input validation error in the fcronsighup utility can be exploited to delete arbitrary files by setting a specially crafted value for fcrontabs in a configuration file.

4) An error causes the file descriptors for "/etc/fcron.allow" and "/etc/fcron.deny" to leak, which can be exploited to read the content of these files.

The vulnerabilities have been reported in versions 2.0.1 and 2.9.4. Prior versions may also be affected.

Solution
Update to version 2.0.2 or later.
Further details available in Customer Area

Provided and/or discovered by
Karol Wiesek

Original Advisory
iDEFENSE:
http://www.idefense.com/application/poi/display?id=157&type=vulnerabilities

Deep Links
Links available in Customer Area