CVE-2012-3461

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.

🔗 References (32)

• secalert@redhathttp://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684121
• secalert@redhathttp://lists.cypherpunks.ca/pipermail/otr-dev/2012-July/001347.html
• secalert@redhathttp://lists.cypherpunks.ca/pipermail/otr-dev/2012-July/001348.html
• secalert@redhathttp://lists.opensuse.org/opensuse-security-announce/2012-11/msg00016.html
• secalert@redhathttp://lists.opensuse.org/opensuse-security-announce/2012-11/msg00019.html
• secalert@redhathttp://lists.opensuse.org/opensuse-security-announce/2013-01/msg00019.html
• secalert@redhathttp://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr%3Ba=commitdiff%3Bh=1902baee5d4b056850274ed0fa8c2409f1187435
• secalert@redhathttp://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr%3Ba=commitdiff%3Bh=6d4ca89cf1d3c9a8aff696c3a846ac5a51f762c1
• secalert@redhathttp://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr%3Ba=commitdiff%3Bh=b17232f86f8e60d0d22caf9a2400494d3c77da58
• secalert@redhathttp://www.debian.org/security/2012/dsa-2526
• secalert@redhathttp://www.mandriva.com/security/advisories?name=MDVSA-2012:131
• secalert@redhathttp://www.mandriva.com/security/advisories?name=MDVSA-2013:097
• secalert@redhathttp://www.securityfocus.com/bid/54907
• secalert@redhathttp://www.ubuntu.com/usn/USN-1541-1
• secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=846377