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[ GLSA 200512-09 ] cURL: Off-by-one errors in URL handling
From: Sune Kloppenborg Jeppesen <jaervosz () gentoo org>
Date: Fri, 16 Dec 2005 17:57:32 +0100

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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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