Heap-based buffer overflow in dnsmasq (Alpine package)

1) Heap-based buffer overflow

EUVDB-ID: #VU8661

Risk: Medium

CVSSv4.0: 7.4 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2017-14492

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to boundary error when processing IPv6 router advertisements. A remote unauthenticated attacker on local network can send specially crafted IPv6 router advertisement to the affected service, trigger heap-based buffer overflow and crash the service or execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

dnsmasq (Alpine package): 2.52-r0 - 2.76-r1

CPE2.3

• cpe:2.3:o:alpine:dnsmasq_alpine_package:2.52-r0:*:*:*:*:alpine_linux:*:1.10
• cpe:2.3:o:alpine:dnsmasq_alpine_package:2.55-r0:*:*:*:*:alpine_linux:*:2.0
• cpe:2.3:o:alpine:dnsmasq_alpine_package:2.57-r0:*:*:*:*:alpine_linux:*:2.2

External links

https://git.alpinelinux.org/aports/commit/?id=3640e0ea2d3be8fc17d71b9faad5a0b8806d7f78
https://git.alpinelinux.org/aports/commit/?id=3afe33ad348010beb44371a68febd5f2f252299a
https://git.alpinelinux.org/aports/commit/?id=43dd2c9dbd748d5b095ba9eec3da18255d5bd158
https://git.alpinelinux.org/aports/commit/?id=e2b7176ff9d902f7e8837d4a7ef0d560c903fc35

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.