Assertion failure in bind (Alpine package)

1) Assertion failure

EUVDB-ID: #VU16152

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3136

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to the servers are configured to use DNS64 and if the option "break-dnssec yes;" is in use. A remote attacker can supply specially crafted queries, if it was configured to use the DNS64 feature and other preconditions were met, trigger a server using DNS64 assertion failure and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.10.4_p6-r0

External links

http://git.alpinelinux.org/aports/commit/?id=2bfbca724f8810840c93ea17e972afbb84233739
http://git.alpinelinux.org/aports/commit/?id=b3fd1eb4e8e0f578e1fbaf76d9903a9012274dee
http://git.alpinelinux.org/aports/commit/?id=4105cc0c96fb20b95bd9f54160b62af7ca88cd72
http://git.alpinelinux.org/aports/commit/?id=678f234c682be06018570ae854e6749b50a56528
http://git.alpinelinux.org/aports/commit/?id=e049b1d35bb80fed35d73f2ddbdf64484041442d
http://git.alpinelinux.org/aports/commit/?id=e1c82f92f256c814e32451da7b302a8d83f94800
http://git.alpinelinux.org/aports/commit/?id=2542b4ba677184fdcb83fc2fdf9dcf5c2dd6fbb8
http://git.alpinelinux.org/aports/commit/?id=ec799e60eab57b781fa19ba2f7e79f65b7ea4cbe

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.