CVE-2020-25681
High
Description
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Thekelleys Dnsmasq
PublishedJan 20, 2021
First seenJan 20, 2021
Weakness typeCWE-122CWE-122
How to fix
Update
- thekelleys dnsmasq2.83 or later
Vendor advisories
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
- security.gentoo.org/glsa/202101-17
- debian.org/security/2021/dsa-4844
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| thekelleys dnsmasq | v < 2.83 | 2.83 |
| fedoraproject fedora | 32, 33 | — |
| debian debian_linux | 9.0, 10.0 | — |
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