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OVAL Definitions
>
OVAL Definition Details
Id
oval:com.altx-soft.nix:def:26726
[Rus]
Version
2
Class
patch
ALTXid
154001
Language
English
Severity
Medium
Title
ALAS-2016-750 -- security update for openvpn
Description
Ciphers with 64-bit block sizes used in CBC mode were found to be vulnerable to a birthday attack when key renegotiation doesn't happen frequently or at all in long running connections. The blowfish cipher as used in OpenVPN by default is vulnerable to this attack, allowing a remote attacker to recover partial plaintext information (XOR of two plaintext blocks).
Family
unix
Platform
Amazon Linux AMI
Product
openvpn
Reference
VENDOR: ALAS-2016-750
VENDOR: ALAS-2016-750
Id:
ALAS-2016-750
Reference:
https://alas.aws.amazon.com/ALAS-2016-750.html
CVE: CVE-2016-6329
CVE: CVE-2016-6329
Id:
CVE-2016-6329
Reference:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6329
Comment
: OpenVPN, when using a 64-bit block cipher, makes it easier for remote attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as demonstrated by an HTTP-over-OpenVPN session using Blowfish in CBC mode, aka a "Sweet32" attack.
CVSSv2 Score:
4.3
Access vector:
NETWORK
Access complexity:
MEDIUM
Authentication:
NONE
Confidentiality impact:
PARTIAL
Integrity impact:
NONE
Availability impact:
NONE
CVSSv2 Vector:
AV:N/AC:M/Au:N/C:P/I:N/A:N
CVSSv3 Score:
5.9
Attack vector:
NETWORK
Attack complexity:
HIGH
Privileges required:
NONE
User interaction:
NONE
Scope:
UNCHANGED
Confidentiality impact:
HIGH
Integrity impact:
NONE
Availability impact:
NONE
CVSSv3 Vector:
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE:
310 (Cryptographic Issues)
References:
https://sweet32.info/ (MISC)
GLSA-201611-02 (GENTOO)
https://community.openvpn.net/openvpn/wiki/SWEET32 (CONFIRM)
http://www-01.ibm.com/support/docview.wss?uid=swg21995039 (CONFIRM)
http://www-01.ibm.com/support/docview.wss?uid=swg21991482 (CONFIRM)
http://www-01.ibm.com/support/docview.wss?uid=nas8N1021697 (CONFIRM)
1036695 (SECTRACK)
92631 (BID)
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05369403 (CONFIRM)
https://cert-portal.siemens.com/productcert/pdf/ssa-556833.pdf (CONFIRM)
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