CVE-2012-1569

Priority
Medium
Description
The asn1_get_length_der function in decoding.c in GNU Libtasn1 before 2.12,
as used in GnuTLS before 3.0.16 and other products, does not properly
handle certain large length values, which allows remote attackers to cause
a denial of service (heap memory corruption and application crash) or
possibly have unspecified other impact via a crafted ASN.1 structure.
References
Bugs
Notes
 jdstrand> per Simon Josefsson (upstream), asn1_get_length_der() does not
  itself have the vulnerability, but that callers wouldn't check its return
  code which could cause a DoS. It was deemed easier for asn1_get_length_der()
  to throw an error rather than changing all callers.
 jdstrand> archive grep results for asn1_get_length_der():
  https://chinstrap.canonical.com/~jamie/libtasn1.log
 mdeslaur> gnutls test: http://git.savannah.gnu.org/gitweb/?p=gnutls.git;a=commit;h=88138dc44fc00f2887956d71e0febd2656e1fd9f
 mdeslaur> libtasn test:
 mdeslaur> http://git.savannah.gnu.org/cgit/libtasn1.git/plain/tests/Test_overflow.c
Assigned-to
mdeslaur
Package
Upstream:released (2.12-1)
Ubuntu 12.04 LTS (Precise Pangolin):released (2.10-1ubuntu1.1)
Patches:
Upstream:http://article.gmane.org/gmane.comp.gnu.libtasn1.general/54
Vendor:http://www.debian.org/security/2012/dsa-2440
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Updated: 2015-07-29 20:40:34 UTC (commit 9756)