Zero-day vulnerability in ISC BIND

Denial of service
CVE-2013-4854

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:3.1/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

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.

External links:

https://kb.isc.org/article/AA-01015

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.