[SECURITY] Fedora 20 Update: perl-YAML-LibYAML-0.41-4.fc20

updates at fedoraproject.org updates at fedoraproject.org
Mon Apr 7 03:24:16 UTC 2014

Fedora Update Notification
2014-03-30 05:17:33

Name        : perl-YAML-LibYAML
Product     : Fedora 20
Version     : 0.41
Release     : 4.fc20
URL         : http://search.cpan.org/dist/YAML-LibYAML/
Summary     : Perl YAML Serialization using XS and libyaml
Description :
Kirill Siminov's "libyaml" is arguably the best YAML implementation. The C
library is written precisely to the YAML 1.1 specification. It was originally
bound to Python and was later bound to Ruby.

Update Information:

This update addressed two security issues.

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.

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.

* Thu Mar 27 2014 Paul Howarth <paul at city-fan.org> - 0.41-4
- Fix LibYAML input sanitization errors (CVE-2014-2525)
- Fix heap-based buffer overflow when parsing YAML tags (CVE-2013-6393)

  [ 1 ] Bug #1078083 - CVE-2014-2525 libyaml: heap-based buffer overflow when parsing URLs
  [ 2 ] Bug #1033990 - CVE-2013-6393 libyaml: heap-based buffer overflow when parsing YAML tags

This update can be installed with the "yum" update program.  Use
su -c 'yum update perl-YAML-LibYAML' at the command line.
For more information, refer to "Managing Software with yum",
available at http://docs.fedoraproject.org/yum/.

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