LibYAML 0.1.4 remote DoS

2014.02.10
Credit: Murray
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

The yaml_parser_scan_tag_uri function in scanner.c in LibYAML before 0.1.5 performs an incorrect cast, which allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted tags in a YAML document, which triggers a heap-based buffer overflow. FIX: /* Resize the string to include the head. */ while ((size_t)(string.end - string.start) <= length) { if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) { parser->error = YAML_MEMORY_ERROR; goto error;

References:

https://bugzilla.redhat.com/show_bug.cgi?id=1033990
https://bugzilla.redhat.com/attachment.cgi?id=847926&action=diff
https://bitbucket.org/xi/libyaml/commits/tag/0.1.5
http://www.securityfocus.com/bid/65258
http://osvdb.org/102716


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