SB2019031405 - Gentoo update for BIND

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2018-5738)

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to improper access controls. When configured with "recursion yes;" and match list values are not provided for "allow-query-cache" or "allow-query", the "allow-recursion" setting may permit all hosts to perform recursion. A remote attacker can bypass intended recursion access controls, make a recursive query to a BIND nameserver in certain cases and examine the results of queries answered from the cache to determine which queries a server has previously responded to.

2) Assertion failure (CVE-ID: CVE-2018-5740)

The vulnerability allows an attacker to perform denial of service (DoS) attack.

The vulnerability exists due to INSIST assertion failure in name.c when processing recursive queries. A remote attacker can trigger denial of service conditions if the affected server is configured with enabled "deny-answer-aliases" feature.

3) Security restrictions bypass (CVE-ID: CVE-2018-5741)

The vulnerability allows a remote authenticated attacker to bypass security restrictions on the target system.

The vulnerability exists due to an error in the documentation of the 'update-policy' feature for the 'krb5-subdomain' and 'ms-subdomain' update policies. A remote attacker can bypass security restrictions to modify records in the zone at or below the name specified in the name field.

Remediation

Install update from vendor's website.

References

• https://security.gentoo.org/glsa/201903-13