Input validation error in bind (Alpine package)

1) Input validation error

EUVDB-ID: #VU33826

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-4620

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

name.c in named in ISC BIND 9.7.x through 9.9.x before 9.9.7-P1 and 9.10.x before 9.10.2-P2, when configured as a recursive resolver with DNSSEC validation, allows remote attackers to cause a denial of service (REQUIRE assertion failure and daemon exit) by constructing crafted zone data and then making a query for a name in that zone.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.7.1-r0 - 9.9.7-r0

CPE2.3

• cpe:2.3:o:alpine:bind_alpine_package:9.9.6_p2-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:bind_alpine_package:9.7.3-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:bind_alpine_package:9.7.4_p1-r0:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=94177d198b2c373d78e3bfeccefba287cea0899d
http://git.alpinelinux.org/aports/commit/?id=04d850a4688fbc93cc8bee5266eda1a0420639c8
http://git.alpinelinux.org/aports/commit/?id=5a6eb2946c459470eb1ee36aca054c7440dff5f9

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.