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libtasn1 Heap Overflow

libtasn1 Heap Overflow
Posted May 1, 2015
Authored by Hanno Boeck | Site hboeck.de

Fuzzing GnuTLS, it was discovered that a malformed certificate input sample would cause a heap overflow read of 99 bytes in the DER decoding functions of Libtasn1. The heap overflow happens in the function _asn1_extract_der_octet().

tags | advisory, overflow
MD5 | 1efcb67683ea76bca3f30eb9e4cc0311

libtasn1 Heap Overflow

Change Mirror Download
https://blog.fuzzing-project.org/9-Heap-overflow-invalid-read-in-Libtasn1-TFPA-0052015.html

While fuzzing GnuTLS I discovered a malformed certificate input sample
that would cause a heap overflow read of 99 bytes in the DER decoding
functions of Libtasn1. The heap overflow happens in the function
_asn1_extract_der_octet().

This issue was reported to the Libtasn1 developer on 16th April. A fix
was committed on 20th April and is part of the Libtasn1 4.5 release.
This issue was found with american fuzzy lop and address sanitizer.

http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commitdiff;h=f979435823a02f842c41d49cd41cc81f25b5d677
Git commit / fix

https://lists.gnu.org/archive/html/help-libtasn1/2015-04/msg00000.html
Libtasn1 4.5 release notes

https://crashes.fuzzing-project.org/TFPA-2015-005-libtasn1-4.4-heap-overflow.crt
Sample malformed certificate exposing heap overflow (test with
certtool -i --inder --infile=[sample] and address sanitizer or
valgrind)

--
Hanno Böck
http://hboeck.de/

mail/jabber: hanno@hboeck.de
GPG: BBB51E42
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