CVE-2021-45955

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 v3 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35898	Exploit Issue Tracking Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-932.yaml	Third Party Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html	Mailing List Third Party Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:thekelleys:dnsmasq:2.86:*:*:*:*:*:*:*

History

No history.

Information

Published : 2022-01-01 00:15

Updated : 2024-06-11 16:15

NVD link : CVE-2021-45955

Mitre link : CVE-2021-45955

CVE.ORG link : CVE-2021-45955

JSON object : View

Products Affected

thekelleys

dnsmasq

CWE

CWE-787

Out-of-bounds Write

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