Debian update for bind9



| Updated: 2021-11-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-25219
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 bind9 (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU57752

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-25219

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to BIND does not properly control consumption of internal resources when processing lame cache. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Update bind9 package to one of the following versions: 1:9.11.5.P4+dfsg-5.1+deb10u6, 1:9.16.22-1~deb11u1.

Vulnerable software versions

bind9 (Debian package): 1:9.11.5.P4+dfsg-5.1+deb10u1 - 9.11.5.P4+dfsg-5.1+deb10u2

CPE2.3 External links

https://www.debian.org/security/2021/dsa-4994


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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