#VU32820 Cryptographic issues in OpenSSL - CVE-2012-0884

Vulnerability identifier: #VU32820

Vulnerability risk: Medium

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

CVE-ID: CVE-2012-0884

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

The implementation of Cryptographic Message Syntax (CMS) and PKCS #7 in OpenSSL before 0.9.8u and 1.x before 1.0.0h does not properly restrict certain oracle behavior, which makes it easier for context-dependent attackers to decrypt data via a Million Message Attack (MMA) adaptive chosen ciphertext attack.

Mitigation
Install update from vendor's website.

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, 0.9.8m - 0.9.8p, 1.0.0c - 1.0.0

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External links
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/077086.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/077221.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/077666.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-November/092905.html
https://marc.info/?l=bugtraq&m=133728068926468&w=2
https://marc.info/?l=bugtraq&m=133951357207000&w=2
https://marc.info/?l=bugtraq&m=134039053214295&w=2
https://rhn.redhat.com/errata/RHSA-2012-0426.html
https://rhn.redhat.com/errata/RHSA-2012-0488.html
https://rhn.redhat.com/errata/RHSA-2012-0531.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/48580
https://secunia.com/advisories/48895
https://secunia.com/advisories/48916
https://secunia.com/advisories/57353
https://www.debian.org/security/2012/dsa-2454
https://www.kb.cert.org/vuls/id/737740
https://www.openssl.org/news/secadv_20120312.txt
https://www-01.ibm.com/support/docview.wss?uid=ssg1S1004564
https://downloads.avaya.com/css/P8/documents/100162507
https://hermes.opensuse.org/messages/14330767

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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.