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Gentoo Linux Security Advisory                           GLSA 200512-09
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                                            https://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
          [ 2 ] Hardened-PHP Advisory
        http://www.hardened-php.net

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/200512-09

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
https://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.

https://creativecommons.org/licenses/by-sa/2.0/