Medium severity · published Apr 8, 2021
CVE-2021-3448
A flaw was found in dnsmasq in versions before 2.85
4.0
CVSS
2.3%
EPSS
No
On KEV
Description
A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 83% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
DN
Dnsmasq · Thekelleys
before 2.85 · source: NVD
EL
Enterprise Linux · Redhat
8.0 · source: NVD
FE
Fedora · Fedoraproject
32; 33; 34 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3448
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3448
Exploit
https://bugzilla.redhat.com/show_bug.cgi?id=1939368
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
Third Party Advisory
https://security.gentoo.org/glsa/202105-20
Patch
https://www.oracle.com/security-alerts/cpujan2022.html
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