CVE-2024-1931: fedora — Fix

Description

NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite loop. Unbound 1.18.0 introduced a feature that removes EDE records from responses with size higher than the client's advertised buffer size. Before removing all the EDE records however, it would try to see if trimming the extra text fields on those records would result in an acceptable size while still retaining the EDE codes. Due to an unchecked condition, the code that trims the text of the EDE records could loop indefinitely. This happens when Unbound would reply with attached EDE information on a positive reply and the client's buffer size is smaller than the needed space to include EDE records. The vulnerability can only be triggered when the 'ede: yes' option is used; non default configuration. From version 1.19.2 on, the code is fixed to avoid looping indefinitely.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-835 CWE-835

Affected Products

Vendor	Product	Versions
nlnetlabs	unbound	1.18.0 — 1.19.2
fedoraproject	fedora	All
fedoraproject	fedora	All
fedoraproject	fedora	All

References

Advisories & Patches

https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-1931.txt https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-1931.txt

Other References

https://lists.fedoraproject.org/archives/list/[email protected]/message/4VCBRQ7KMSIGBQ6A4SBL5PF326DIJIIV/ https://lists.fedoraproject.org/archives/list/[email protected]/message/B2JUIFPA7H75Q2W3VXW2TUNHK6NVGOX4/ https://lists.fedoraproject.org/archives/list/[email protected]/message/RBR4H7RCVMJ6H76S4LLRSY5EBFTYWGXK/ https://lists.freebsd.org/archives/freebsd-security/2024-July/000283.html https://security.netapp.com/advisory/ntap-20240705-0006/ https://lists.fedoraproject.org/archives/list/[email protected]/message/4VCBRQ7KMSIGBQ6A4SBL5PF326DIJIIV/ https://lists.fedoraproject.org/archives/list/[email protected]/message/B2JUIFPA7H75Q2W3VXW2TUNHK6NVGOX4/ https://lists.fedoraproject.org/archives/list/[email protected]/message/RBR4H7RCVMJ6H76S4LLRSY5EBFTYWGXK/ https://lists.freebsd.org/archives/freebsd-security/2024-July/000283.html https://security.netapp.com/advisory/ntap-20240705-0006/

Frequently Asked Questions

What is CVE-2024-1931? +

NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite loop. Unbound 1.18.0 introduced a feature that removes EDE records from responses with size higher than the client's advertised buffer size. Before removing all the EDE records however, it would try to see if trimming the extra text fields on those records would result in an acceptable size while still retaining the EDE codes. Due to an unchecked condition, the code that trims the text of the EDE records could loop indefinitely. This happens when Unbound would reply with attached EDE information on a positive reply and the client's buffer size is smaller than the needed space to include EDE records. The vulnerability can only be triggered when the 'ede: yes' option is used; non default configuration. From version 1.19.2 on, the code is fixed to avoid looping indefinitely. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2024-1931? +

CVE-2024-1931 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-1931? +

CVE-2024-1931 affects products from fedoraproject, nlnetlabs, specifically: fedora, unbound. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-1931? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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