From: Sune Kloppenborg Jeppesen <jaervosz@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200512-09 ] cURL: Off-by-one errors in URL handling
Date: Fri, 16 Dec 2005 17:57:32 +0100
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Cc: bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk,
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Organization: Gentoo Linux Security Team
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Gentoo Linux Security Advisory GLSA 200512-09
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http://security.gentoo.org/
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Severity: Low
Title: cURL: Off-by-one errors in URL handling
Date: December 16, 2005
Bugs: #114710
ID: 200512-09
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Synopsis
========
cURL is vulnerable to local arbitrary code execution via buffer
overflow due to the insecure parsing of URLs.
Background
==========
cURL is a command line tool for transferring files with URL syntax,
supporting numerous protocols.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/curl < 7.15.1 >= 7.15.1
Description
===========
Stefan Esser from the Hardened-PHP Project has reported a vulnerability
in cURL that allows for a local buffer overflow when cURL attempts to
parse specially crafted URLs. The URL can be specially crafted in one
of two ways: the URL could be malformed in a way that prevents a
terminating null byte from being added to either a hostname or path
buffer; or the URL could contain a "?" separator in the hostname
portion, which causes a "/" to be prepended to the resulting string.
Impact
======
An attacker capable of getting cURL to parse a maliciously crafted URL
could cause a denial of service or execute arbitrary code with the
privileges of the user making the call to cURL. An attacker could also
escape open_basedir or safe_mode pseudo-restrictions when exploiting
this problem from within a PHP program when PHP is compiled with
libcurl.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All cURL users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/curl-7.15.1"
References
==========
[ 1 ] CVE-2005-4077
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-4077
[ 2 ] Hardened-PHP Advisory
http://www.hardened-php.net/advisory_242005.109.html
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200512-09.xml
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.0
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