Information disclosure in OpenSSL - CVE-2016-7055

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Main Vulnerability Database Vulnerabilities #VU5894

Information disclosure in OpenSSL - CVE-2016-7055

Published: February 23, 2017 / Updated: March 30, 2018


Vulnerability identifier: #VU5894
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-7055
CWE-ID: CWE-310
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to decrypt certain data.

The vulnerability exists in OpenSSL implementation due to propagating bug in the Broadwell-specific Montgomery multiplication procedure that handles input lengths divisible by, but longer than 256 bits. A remote attacker can launch attacks against RSA, DSA and DH private keys and decrypt information, passed over encrypted channels. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation.

Successful exploitation of the vulnerability may allow an attacker in certain conditions to launch attacks against OpenSSL clients.


Affected software

OpenSSL
Arch Linux
Gentoo Linux
FreeBSD
Ubuntu
Slackware Linux
Opensuse
openssl (Alpine package)
Data ONTAP operating in 7-Mode
MySQL Server

SnapDrive for Windows
SBR Carrier
NetWorker

How to mitigate CVE-2016-7055

Update OpenSSL to version  1.0.2 or 1.1.0c.

openssl (Alpine package) - update to 1.0.2k-r0
SnapDrive for Windows - update to 7.1.4P1
Data ONTAP operating in 7-Mode - update to 8.2.5
SBR Carrier - addressed in versions 8.4.1R13, 8.5.0R4
NetWorker - update to 19.10.0.0

External References

Related Security Bulletins