SB2017030136 - Fedora 25 update for bind99

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) NULL pointer dereference (CVE-ID: CVE-2017-3135)

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

The vulnerability exists due to NULL pointer dereference error when parsing DNS queries, if ISC BIND is configured with Response Policy Zones (RPZ) and DNS64 to rewrite query responses. A remote unauthenticated attacker can send specially crafted DNS queries, trigger NULL pointer dereference and cause denial of service.

Successful exploitation of the vulnerability will result in DoS attack against affected daemon.

2) Denial of service (CVE-ID: CVE-2016-8864)

The vulnerability allows a remote unauthenticated user to cause DoS conditions on the target system.
The weakness is due to imptoper input validation. By returning a recursive response containing a specially crafted DNAME answer, a remote attacker can trigger a flaw in 'db.c' or 'resolver.c' and cause the target resolver to crash.
Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Remediation

Install update from vendor's website.

References

• https://bodhi.fedoraproject.org/updates/FEDORA-2017-96b7f4f53e