bugtraq - [oCERT-2014-003] LibYAML input sanitization errors

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20140326230731.GZ21794@core.inversepath.com>
Date: Thu, 27 Mar 2014 00:07:31 +0100
From: Andrea Barisani <lcars@...rt.org>
To: oss-security@...ts.openwall.com, ocert-announce@...ts.ocert.org,
  bugtraq@...urityfocus.com
Subject: [oCERT-2014-003] LibYAML input sanitization errors


#2014-003 LibYAML input sanitization errors

Description:

The LibYAML project is an open source YAML 1.1 parser and emitter written in
C.

The library is affected by a heap-based buffer overflow which can lead to
arbitrary code execution. The vulnerability is caused by lack of proper
expansion for the string passed to the yaml_parser_scan_uri_escapes()
function.

A specially crafted YAML file, with a long sequence of percent-encoded
characters in a URL, can be used to trigger the overflow.

Affected version:

LibYAML <= 0.1.5

Fixed version:

LibYAML >= 0.1.6

Credit: vulnerability report received from Ivan Fratric of the
        Google Security Team.

CVE: CVE-2014-2525

Timeline:

2014-03-11: vulnerability report received
2014-03-14: maintainer provides patch for review
2014-03-17: reporter confirms patch
2014-03-17: disclosure coordinated on 2014-03-26
2014-03-18: contacted affected vendors
2014-03-18: assigned CVE
2014-03-26: LibYAML 0.1.6 released
2014-03-26: advisory release

References:
http://pyyaml.org/wiki/LibYAML
https://bitbucket.org/xi/libyaml/commits/bce8b60f0b9af69fa9fab3093d0a41ba243de048

Permalink:
http://www.ocert.org/advisories/ocert-2014-003.html

-- 
Andrea Barisani |                Founder & Project Coordinator
          oCERT | OSS Computer Security Incident Response Team

<lcars@...rt.org>                         http://www.ocert.org
 0x864C9B9E 0A76 074A 02CD E989 CE7F AC3F DA47 578E 864C 9B9E
        "Pluralitas non est ponenda sine necessitate"