CVE-2020-25682

Name
CVE-2020-25682
Description
A flaw was found in dnsmasq before 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
NVD Severity
high
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
Third Party Advisory https://www.jsof-tech.com/disclosures/dnspooq/
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1882014
Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
Third Party Advisory https://security.gentoo.org/glsa/202101-17
Third Party Advisory https://www.debian.org/security/2021/dsa-4844
Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
Mailing List https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* dnsmasq >= None < 2.83

Vulnerable and fixed packages

Source package Branch Version Maintainer Status