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file: Integer overflow


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200705-25 / file
Release Date May 31, 2007
Latest Revision June 01, 2007: 02
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
sys-apps/file < 4.21 >= 4.21 x86 ppc hppa

Related bugreports: #179583


An integer overflow vulnerability has been reported in file allowing for the user-assisted execution of arbitrary code.

2.  Impact Information


file is a utility that guesses a file format by scanning binary data for patterns.


Colin Percival from FreeBSD reported that the previous fix for the file_printf() buffer overflow introduced a new integer overflow.


A remote attacker could entice a user to run the file program on an overly large file (more than 1Gb) that would trigger an integer overflow on 32-bit systems, possibly leading to the execution of arbitrary code with the rights of the user running file.

3.  Resolution Information


There is no known workaround at this time.


Since file is a system package, all Gentoo users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/file-4.21"

4.  References


Page updated May 31, 2007

Summary: This is a Gentoo Linux Security Advisory

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