Denial of service in OpenSSL - CVE-2016-6305

Vulnerability identifier: #VU820

CSH Severity: Low

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2016-6305

CWE-ID: CWE-120

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote unauthenticated user to cause DoS conditions on the vulnerable system.
The weakness is due to flaw in handling of SSL/TLS protocol during a call to SSL_peek(). By sending an empty record attackers can trigger the affected service hang or deny.
Successful exploitation of the vulnerability will result in denial of service on the vulnerable system.

OpenSSL
Gentoo Linux
Slackware Linux
openssl (Alpine package)
openssl
openssl-solibs
dev-libs/openssl

Update 1.1.0 to version 1.1.0a.

openssl (Alpine package) - update to 1.0.1u-r0
openssl - addressed in versions 1.0.1u, 1.0.2i
openssl-solibs - addressed in versions 1.0.1u, 1.0.2i
dev-libs/openssl - update to 1.0.2j

• https://www.openssl.org/news/secadv/20160922.txt
• http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

• Denial of service in OpenSSL
• Denial of service in openssl (Alpine package)
• Gentoo update for OpenSSL
• Slackware Linux update for openssl