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file: Integer underflow


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200703-26 / file
Release Date March 30, 2007
Latest Revision March 30, 2007: 01
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
sys-apps/file < 4.20 >= 4.20 All supported architectures

Related bugreports: #171452


A buffer underflow 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.


Jean-Sebastien Guay-Leroux reported an integer underflow in file_printf function.


A remote attacker could entice a user to run the "file" program on a specially crafted file that would trigger a heap-based buffer overflow possibly leading to the execution of arbitrary code with the rights of the user running "file". Note that this vulnerability could be also triggered through an automatic file scanner like amavisd-new.

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-4.20"

4.  References


Page updated March 30, 2007

Summary: This is a Gentoo Linux Security Advisory

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