CVE-2021-45955 Information

Description

DISPUTED Dnsmasq 2.86 has a heap-based buffer overflow in resize_packet (called from FuzzResizePacket and fuzz_rfc1035.c) because of the lack of a proper bounds check upon pseudo header re-insertion. NOTE: the vendor’s position is that CVE-2021-45951 through CVE-2021-45957 \do not represent real vulnerabilities to the best of our knowledge.\ However a contributor states that a security patch (mentioned in 016162.html) is needed.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-932.yaml https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35898 https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8