CVE-2024-12133: Libtasn1: inefficient der decoding in libtasn1 leading to potential remote dos
First published: Thu Feb 06 2025(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Libtasn1 | <4.20.0 | |
| debian/libtasn1-6 | <=4.16.0-2+deb11u1 | 4.16.0-2+deb11u2 4.19.0-2+deb12u1 4.20.0-2 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2024-12133
- https://bugzilla.redhat.com/show_bug.cgi?id=2344611
- https://gitlab.com/gnutls/libtasn1/-/issues/52
- http://www.openwall.com/lists/oss-security/2025/02/06/6
- https://lists.debian.org/debian-lts-announce/2025/02/msg00025.html
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-12133
- https://nvd.nist.gov/vuln/detail/CVE-2024-12133
- https://launchpad.net/bugs/cve/CVE-2024-12133
- https://security-tracker.debian.org/tracker/CVE-2024-12133
- https://ubuntu.com/security/CVE-2024-12133
- https://www.openwall.com/lists/oss-security/2025/02/06/6
- https://gitlab.com/gnutls/libtasn1/-/commit/4082ca2220b5ba910b546afddf7780fc4a51f75a
- https://gitlab.com/gnutls/libtasn1/-/commit/869a97aa259dffa2620dabcad84e1c22545ffc3d
- https://lists.gnu.org/archive/html/help-libtasn1/2025-02/msg00001.html
- https://access.redhat.com/errata/RHSA-2025:4049
Frequently Asked Questions
What is the severity of CVE-2024-12133?
CVE-2024-12133 is considered moderate because it can lead to significant performance degradation or crashes when processing certain certificate data.
How do I fix CVE-2024-12133?
To fix CVE-2024-12133, update libtasn1 to version 4.20.1 or later, where the vulnerability is addressed.
What systems are affected by CVE-2024-12133?
CVE-2024-12133 affects GNU libtasn1 version 4.20.0 specifically.
What impact does CVE-2024-12133 have on systems?
CVE-2024-12133 can lead to inefficient handling of certificate data, resulting in slowdowns or crashes.
Can CVE-2024-12133 be exploited remotely?
Yes, CVE-2024-12133 can be exploited by attackers sending specially crafted certificate data.
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