Ubuntu update for OpenSSL

1) Information disclosure

EUVDB-ID: #VU2972

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-0701

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to DH_check_pub_key() function in crypto/dh/dh_check.c in OpenSSL 1.0.2 before 1.0.2f does not ensure that prime numbers are appropriate for Diffie-Hellman (DH) key exchange, which makes it easier for remote attackers to discover a private DH exponent by making multiple handshakes with a peer that chose an inappropriate number, as demonstrated by a number in an X9.42 file.

Mitigation

Update the affected packages

Ubuntu 15.10:

libssl1.0.0 1.0.2d-0ubuntu1.3

Vulnerable software versions

openssl (Ubuntu package): 1.0.2d-0ubuntu1 - 1.0.2d-0ubuntu1.2

CPE2.3

• cpe:2.3:o:canonical:openssl_ubuntu_package:1.0.2d-0ubuntu1:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:openssl_ubuntu_package:1.0.2d-0ubuntu1.2:*:*:*:*:ubuntu:*:*

External links

https://www.ubuntu.com/usn/usn-2883-1/

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.