Ubuntu update for Bind

1) Denial of service

EUVDB-ID: #VU4572

Risk: High

CVSSv4.0: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2013-4854

CWE-ID: CWE-388 - Error Handling

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to an error in the RFC 5011 implementation in rdata.c when parsing RDATA within a DNS query. By using a query with a malformed RDATA section that is not properly handled during construction of a log message, a remote attacker can cause an assertion failure and named daemon exit.

Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation

Update the affected packages

Ubuntu 13.04:

bind9 1:9.9.2.dfsg.P1-2ubuntu2.1

libdns95 1:9.9.2.dfsg.P1-2ubuntu2.1

Ubuntu 12.10:

bind9 1:9.8.1.dfsg.P1-4.2ubuntu3.3

libdns81 1:9.8.1.dfsg.P1-4.2ubuntu3.3

Ubuntu 12.04 LTS:

bind9 1:9.8.1.dfsg.P1-4ubuntu0.7

libdns81 1:9.8.1.dfsg.P1-4ubuntu0.7

Ubuntu 10.04 LTS:

libdns64 1:9.7.0.dfsg.P1-1ubuntu0.10

bind9 1:9.7.0.dfsg.P1-1ubuntu0.10

Vulnerable software versions

Ubuntu: 12.04

CPE2.3

• cpe:2.3:o:canonical:ubuntu:12.04:*:*:*:*:*:*:*

External links

https://www.ubuntu.com/usn/usn-1910-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.