SB2013111801 - Information disclosure in openvpn.net OpenVPN
Published: November 18, 2013 Updated: August 3, 2020
Security Bulletin ID
SB2013111801
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Information disclosure (CVE-ID: CVE-2013-2061)
The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier, when running in UDP mode, allows remote attackers to obtain sensitive information via a timing attack involving an HMAC comparison function that does not run in constant time and a padding oracle attack on the CBC mode cipher.
Remediation
Install update from vendor's website.
References
- http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105609.html
- http://lists.opensuse.org/opensuse-updates/2013-11/msg00012.html
- http://lists.opensuse.org/opensuse-updates/2013-11/msg00016.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:167
- http://www.openwall.com/lists/oss-security/2013/05/06/6
- https://bugs.gentoo.org/show_bug.cgi?id=468756
- https://bugzilla.redhat.com/show_bug.cgi?id=960192
- https://community.openvpn.net/openvpn/wiki/SecurityAnnouncement-f375aa67cc
- https://github.com/OpenVPN/openvpn/commit/11d21349a4e7e38a025849479b36ace7c2eec2ee