Cryptographic issues in OpenSSL

1) Cryptographic issues

EUVDB-ID: #VU32820

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2012-0884

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

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 - 1.0.0g

External links

http://lists.fedoraproject.org/pipermail/package-announce/2012-April/077086.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-April/077221.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-April/077666.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-November/092905.html
http://marc.info/?l=bugtraq&m=133728068926468&w=2
http://marc.info/?l=bugtraq&m=133951357207000&w=2
http://marc.info/?l=bugtraq&m=134039053214295&w=2
http://rhn.redhat.com/errata/RHSA-2012-0426.html
http://rhn.redhat.com/errata/RHSA-2012-0488.html
http://rhn.redhat.com/errata/RHSA-2012-0531.html
http://rhn.redhat.com/errata/RHSA-2012-1306.html
http://rhn.redhat.com/errata/RHSA-2012-1307.html
http://rhn.redhat.com/errata/RHSA-2012-1308.html
http://secunia.com/advisories/48580
http://secunia.com/advisories/48895
http://secunia.com/advisories/48916
http://secunia.com/advisories/57353
http://www.debian.org/security/2012/dsa-2454
http://www.kb.cert.org/vuls/id/737740
http://www.openssl.org/news/secadv_20120312.txt
http://www-01.ibm.com/support/docview.wss?uid=ssg1S1004564
http://downloads.avaya.com/css/P8/documents/100162507
http://hermes.opensuse.org/messages/14330767

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.