Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2021-3448 |
CWE-ID | CWE-345 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
Dnsmasq Server applications / DNS servers |
Vendor | GNU |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU52065
Risk: Medium
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3448
CWE-ID:
CWE-345 - Insufficient Verification of Data Authenticity
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a DNS Cache Poisoning attack.
The vulnerability exists due to dnsmasq relies only on transmission ID when processing DNS queries and uses the same port for outgoing requests, when configured to given network interface. A remote attacker can guess the random transmission ID to forge a reply and get it accepted by dnsmasq.As a result, an attacker can perform a DNS Cache Poisoning attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsDnsmasq: 2.0 - 2.84
External linkshttp://bugzilla.redhat.com/show_bug.cgi?id=1939368
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.