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CVE-2020-25687 A flaw was found in dnsmasq before version 2.83
Description
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| dnsmasq | Versions not published |
References
- www.jsof-tech.com www.jsof-tech.com
- bugzilla.redhat.com bugzilla.redhat.com
- FEDORA-2021-84440e87ba lists.fedoraproject.org
- GLSA-202101-17 security.gentoo.org
- DSA-4844 www.debian.org
- FEDORA-2021-2e4c3d5a9d lists.fedoraproject.org
- [debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update lists.debian.org
Timeline
- Published
- Last modified
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CVE-2020-25686
A flaw was found in dnsmasq before version 2.83
Not rated