Memory leak in pdns-recursor (Alpine package)

1) Memory leak

EUVDB-ID: #VU9441

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-15094

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to a flaw in the DNSSEC parsing code of PowerDNS Recursor during a code audit by Nixu. A remote attacker can supply specially crafted DNSSEC ECDSA keys, parse it when validation is enabled by setting dnssec to a value other than off or process-no-validate (default), trigger memory leak and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

pdns-recursor (Alpine package): 4.0.4-r0 - 4.0.9-r0

CPE2.3

• cpe:2.3:o:alpine:pdns-recursor_alpine_package:4.0.4-r0:*:*:*:*:alpine_linux:*:3.4
• cpe:2.3:o:alpine:pdns-recursor_alpine_package:4.0.4-r2:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:o:alpine:pdns-recursor_alpine_package:4.0.6-r1:*:*:*:*:alpine_linux:*:3.6

External links

https://git.alpinelinux.org/aports/commit/?id=c9348fdd367c1a3bd5601701acba7353ae984c3a
https://git.alpinelinux.org/aports/commit/?id=f2ae078758a3a6a9ba1068bf9d79123f305d54f8
https://git.alpinelinux.org/aports/commit/?id=cc8761a9a2849c5e5a49af8667dbea9a2aeb990d
https://git.alpinelinux.org/aports/commit/?id=0821b9aa215845c51715531d9478f41a9322f98c

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.