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Gentoo: cURL Off-by-one errors in URL handling Print E-mail
User Rating:      How can I rate this item?
Posted by Benjamin D. Thomas   
Gentoo cURL is vulnerable to local arbitrary code execution via buffer overflow due to the insecure parsing of URLs.
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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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