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SYNTHESIS OF THE VULNERABILITY

An attacker can generate a buffer overflow of LibYAML, in order to
trigger a denial of service, and possibly to execute code.

Impacted products: Debian, Fedora, MBS, MES, openSUSE, RHEL,
Ubuntu, Unix (platform)

Severity: 2/4

Creation date: 27/03/2014

DESCRIPTION OF THE VULNERABILITY

The LibYAML library is used to read data files in YAML (YAML Ain’t
Markup Language) format.

However, if the size of an url escaped with "%hh" is greater than
the size of the storage array, an overflow occurs in the
yaml_parser_scan_uri_escapes() function of the src/scanner.c file.

An attacker can therefore generate a buffer overflow of LibYAML,
in order to trigger a denial of service, and possibly to execute
code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/LibYAML-buffer-overflow-of-yaml-parser-scan-uri-escapes-14488