Fedora 40 update for unbound

1) Infinite loop

EUVDB-ID: #VU87205

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-1931

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

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

The vulnerability exists due to infinite loop in EDE support when trimming EDE text on
positive replies. A remote attacker can consume all available system resources and cause denial of service conditions.

Successful exploitation of the vulnerability requires enabled support for EDE (not a default option).

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 40

unbound: before 1.19.1-4.fc40

External links

http://bodhi.fedoraproject.org/updates/FEDORA-2024-c266dab9e9

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.