#VU32808 Out-of-bounds read in OpenSSL - CVE-2012-2333

Vulnerability identifier: #VU32808

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-2333

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in Integer underflow in OpenSSL before 0.9.8x, 1.0.0 before 1.0.0j, and 1.0.1 before 1.0.1c, when TLS 1.1, TLS 1.2, or DTLS is used with CBC encryption,. A remote attacker can perform a denial of service (buffer over-read) or possibly have unspecified other impact via a crafted TLS packet that is not properly handled during a certain explicit IV calculation.

Mitigation
The vendor has issued the following versions to address this vulnerability: 0.9.8x, 1.0.1c.

Vulnerable software versions

OpenSSL: 0.9.0b, 0.9.1c - 0.9.1b, 0.9.2b, 0.9.3a - 0.9.3, 0.9.4, 0.9.5a - 0.9.5, 0.9.6g - 0.9.6-15, 0.9.7g - 0.9.7, 0.9.8g - 0.9.8p, 1.0.0k - 1.0.0p, 1.0.1a - 1.0.1

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External links
https://cvs.openssl.org/chngview?cn=22538
https://cvs.openssl.org/chngview?cn=22547
https://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-May/081460.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-November/092905.html
https://lists.opensuse.org/opensuse-security-announce/2012-05/msg00019.html
https://lists.opensuse.org/opensuse-security-announce/2012-05/msg00020.html
https://marc.info/?l=bugtraq&m=134919053717161&w=2
https://marc.info/?l=bugtraq&m=136432043316835&w=2
https://rhn.redhat.com/errata/RHSA-2012-0699.html
https://rhn.redhat.com/errata/RHSA-2012-1306.html
https://rhn.redhat.com/errata/RHSA-2012-1307.html
https://rhn.redhat.com/errata/RHSA-2012-1308.html
https://secunia.com/advisories/49116
https://secunia.com/advisories/49208
https://secunia.com/advisories/49324
https://secunia.com/advisories/50768
https://secunia.com/advisories/51312
https://support.apple.com/kb/HT5784
https://www.cert.fi/en/reports/2012/vulnerability641549.html
https://www.debian.org/security/2012/dsa-2475
https://www.kb.cert.org/vuls/id/737740
https://www.mandriva.com/security/advisories?name=MDVSA-2012:073
https://www.openssl.org/news/secadv_20120510.txt
https://www.securityfocus.com/bid/53476
https://www.securitytracker.com/id?1027057
https://bugzilla.redhat.com/show_bug.cgi?id=820686
https://exchange.xforce.ibmcloud.com/vulnerabilities/75525

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.