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LibYAML 0.1.5 Buffer Overflow

LibYAML 0.1.5 Buffer Overflow
Posted Mar 28, 2014
Authored by Andrea Barisani, Open Source CERT

LibYAML versions 0.1.5 and below are 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.

tags | advisory, overflow, arbitrary, code execution
advisories | CVE-2014-2525
SHA-256 | 801017e1ff1d3bdeae05eeef0c85d7625a0088eef454bd42667d1a259ef47ff8

LibYAML 0.1.5 Buffer Overflow

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