exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

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
SHA-256 | 3b4b298d51f795e837fdad045082d8d21888b30a3c72b0d84495cbda9339fe16

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
Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    0 Files
  • 20
    Mar 20th
    0 Files
  • 21
    Mar 21st
    0 Files
  • 22
    Mar 22nd
    0 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    0 Files
  • 26
    Mar 26th
    0 Files
  • 27
    Mar 27th
    0 Files
  • 28
    Mar 28th
    0 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close