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.
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
| Link | Tags |
|---|---|
| https://www.jsof-tech.com/disclosures/dnspooq/ | third party advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1881875 | issue tracking third party advisory patch |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/ | vendor advisory |
| https://security.gentoo.org/glsa/202101-17 | vendor advisory third party advisory |
| https://www.debian.org/security/2021/dsa-4844 | vendor advisory third party advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/ | vendor advisory |
| https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html | third party advisory mailing list |