Memory corruption in dnsmasq (Alpine package)



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-14496
CWE-ID CWE-119
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 dnsmasq (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Memory corruption

EUVDB-ID: #VU8665

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2017-14496

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

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

The vulnerability exists due to boundary error in  add_pseudoheader() function when processing DNS queries. A remote unauthenticated attacker can send a specially crafted DNS request to the affected service, cause dnsmasq to call memcpy with negative size and crash.

Successful exploitation of this vulnerability may allow an attacker to perform a denial of service (DoS) attack, but requires that dnsmasq is compiled with --add-mac, --add-cpe-id or --add-subnet option.

Mitigation

Install update from vendor's website.

Vulnerable software versions

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

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=e84b81b48310608c89511d450f0deec9b1e04b1c
https://git.alpinelinux.org/aports/commit/?id=9af72b19675b1be5e4f838b5dc97b5fa4d7211d0
https://git.alpinelinux.org/aports/commit/?id=b14fc437abacc82496ff9f347444eb0f5ebd2f3d
https://git.alpinelinux.org/aports/commit/?id=70e17b5cf82bae935c9371277ce3d632742f5488
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 Internet.

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.



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