Bug 2344611 (CVE-2024-12133)

Summary: CVE-2024-12133 libtasn1: Inefficient DER Decoding in libtasn1 Leading to Potential Remote DoS
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: adudiak, kshier, omaciel, stcannon, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw in libtasn1 causes inefficient handling of specific certificate data. When processing a large number of elements in a certificate, libtasn1 takes much longer than expected, which can slow down or even crash the system. This flaw allows an attacker to send a specially crafted certificate, causing a denial of service attack.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2344613, 2344614    
Bug Blocks:    

Description OSIDB Bzimport 2025-02-10 08:22:08 UTC 
The issue is twofold: decoding a DER input with sequences and locating
a specific element in a sequence. Even though a DER sequence is
conceptually an array, in libtasn1 it is represented as a linked list,
whose elements are assigned a string name, such as "?1". Therefore a
simple lookup of an element at a given position is linear O(N) time
complexity. When decoding a DER sequence, in each step libtasn1 looks
up the parent node, recorded on the first element, which requires a
backward linear search, resulting in O(N^2) time complexity.
Comment 3 errata-xmlrpc 2025-04-22 01:24:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:4049 https://access.redhat.com/errata/RHSA-2025:4049
Comment 4 errata-xmlrpc 2025-05-13 09:56:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:7077 https://access.redhat.com/errata/RHSA-2025:7077
Comment 5 errata-xmlrpc 2025-05-20 00:55:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:8021 https://access.redhat.com/errata/RHSA-2025:8021