#VU94783 Integer overflow in Dnsmasq - CVE-2023-49441

Vulnerability identifier: #VU94783

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2023-49441

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Dnsmasq
Server applications / DNS servers

Vendor: GNU

Description

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

The vulnerability exists due to integer overflow within the sha256_transform() function in hash-questions.c when comparing hashes. A remote attacker can send specially crafted data to the server, trigger an integer overflow and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Dnsmasq: 2.0 - 2.89

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External links
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2023q4/017332.html
https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blobdiff;f=src/hash-questions.c;h=e6304ac807a8b7802bb50208ee5a846f4d62d8b7;hp=c1ee1354433df5e4aea1fe9f4622d30eca79ce01;hb=65c2d6afd67a032f45f40d7e4d620f5d73e5f07d;hpb=b27b94cfdc5e0cad6a5a8675471e0bdc64676006

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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.