Zero-day vulnerability in ISC BIND

Denial of service

We are aware of in the wild exploitation of this vulnerability before official patch release.
This vulnerability was discovered by Maxim Shudrak.

Vulnerability details

Advisory: SB2013072601 - Denial of service in ISC BIND

Vulnerable component: ISC BIND

CVE-ID: CVE-2013-4854

CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C

CWE-ID: CWE-388 - Error Handling


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.