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CAPI4Hylafax fax receiver: Execution of arbitrary code


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200610-05 / capi4hylafax
Release Date October 17, 2006
Latest Revision October 17, 2006: 01
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-misc/capi4hylafax < >= All supported architectures

Related bugreports: #145982


CAPI4Hylafax allows remote attackers to execute arbitrary commands.

2.  Impact Information


CAPI4Hylafax makes it possible to send and receive faxes via CAPI and AVM Fritz!Cards.


Lionel Elie Mamane discovered an error in c2faxrecv, which doesn't properly sanitize TSI strings when handling incoming calls.


A remote attacker can send null (\0) and shell metacharacters in the TSI string from an anonymous fax number, leading to the execution of arbitrary code with the rights of the user running c2faxrecv.

3.  Resolution Information


There is no known workaround at this time.


All CAPI4Hylafax users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/capi4hylafax-"

4.  References


Page updated October 17, 2006

Summary: This is a Gentoo Linux Security Advisory

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