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