Vulnerability identifier: #VU2972
Vulnerability risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-200
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
OpenSSL
Server applications /
Encryption software
Vendor: OpenSSL Software Foundation
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 to version 1.0.2f.
Vulnerable software versions
OpenSSL: 1.0.2 - 1.0.2e
External links
http://www.openssl.org/news/secadv/20160128.txt
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.