CAPI4Hylafax fax receiver: Execution of arbitrary code

1. Gentoo Linux Security Advisory

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	< 01.03.00.99.300.3-r1	>= 01.03.00.99.300.3-r1	All supported architectures

Related bugreports: #145982

Synopsis

CAPI4Hylafax allows remote attackers to execute arbitrary commands.

2. Impact Information

Background

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

Description

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

Impact

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

Workaround

There is no known workaround at this time.

Resolution

All CAPI4Hylafax users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/capi4hylafax-01.03.00.99.300.3-r1"

4. References

CVE-2006-3126

Page updated October 17, 2006

Summary: This is a Gentoo Linux Security Advisory

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