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Last updated: 10/2/2014 4:27:32 AM

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Vulnerability Summary for CVE-2012-3461

Original release date: 08/20/2012
Last revised: 08/21/2013
Source: US-CERT/NIST

Overview

The (1) otrl_base64_otr_decode function in src/b64.c; (2) otrl_proto_data_read_flags and (3) otrl_proto_accept_data functions in src/proto.c; and (4) decode function in toolkit/parse.c in libotr before 3.2.1 allocates a zero-length buffer when decoding a base64 string, which allows remote attackers to cause a denial of service (application crash) via a message with the value "?OTR:===.", which triggers a heap-based buffer overflow.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 4.3 (MEDIUM) (AV:N/AC:M/Au:N/C:N/I:N/A:P) (legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows disruption of service

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External Source: XF
Name: libotr-base64-bo(77528)
External Source: UBUNTU
Name: USN-1541-1
External Source: CONFIRM
Name: http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr;a=commitdiff;h=b17232f86f8e60d0d22caf9a2400494d3c77da58
Type: Patch Information; Exploit
External Source: SUSE
Name: openSUSE-SU-2013:0155
External Source: SUSE
Name: SUSE-SU-2012:1578
External Source: DEBIAN
Name: DSA-2526
External Source: MISC
Name: https://bugzilla.redhat.com/show_bug.cgi?id=846377
External Source: MLIST
Name: [OTR-dev] 20120727 otrl_base64_otr_decode() function...
External Source: CONFIRM
Name: http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr;a=commitdiff;h=1902baee5d4b056850274ed0fa8c2409f1187435
Type: Patch Information; Exploit
External Source: SUSE
Name: openSUSE-SU-2012:1525
External Source: BID
Name: 54907
External Source: MLIST
Name: [OTR-dev] 20120727 Re: otrl_base64_otr_decode() function...
External Source: CONFIRM
Name: http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr;a=commitdiff;h=6d4ca89cf1d3c9a8aff696c3a846ac5a51f762c1
Type: Patch Information; Exploit
External Source: MANDRIVA
Name: MDVSA-2012:131
External Source: MISC
Name: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684121
External Source: MANDRIVA
Name: MDVSA-2013:097

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