Red Hat update for bind

1) Denial of Service

EUVDB-ID: #VU703

Risk: Medium

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C]

CVE-ID: CVE-2016-2776

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allow a remote unauthenticated user to cause denial of service (DoS) on the target system.
The weakness exists due to improper construction of queries responses, which meet certain criteria. By sending specially crafted query to the target service the attacker can trigger an assertion failure in buffer.c that leads to crash and denial of the service.
Successful exploitation of the vulnerability results in DoS condeitions on the vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux EUS Compute Node: 7.3

Red Hat Enterprise Linux for Scientific Computing: 6 - 7

Red Hat Enterprise Linux for IBM z Systems: 6 - 7

Red Hat Enterprise Linux Desktop: 5 - 7

Red Hat Enterprise Linux Workstation: 6 - 7

Red Hat Enterprise Linux Server: 6.0 - v.5

External links

http://access.redhat.com/errata/RHSA-2016:1944

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. However, a fully functional exploit for this vulnerability is available.