Loop with Unreachable Exit Condition ('Infinite Loop') Affecting unbound-python package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-RHEL7-UNBOUNDPYTHON-6411373
  • published7 Mar 2024
  • disclosed7 Mar 2024

Introduced: 7 Mar 2024

CVE-2024-1931  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:7 unbound-python.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound-python package and not the unbound-python package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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.

CVSS Scores

version 3.1