CVE-2024-2236: Libgcrypt: vulnerable to marvin attack
First published: Fri Oct 20 2023(Updated: )
A timing based side-channel exists in the libgcrypt RSA implementation which could be sufficient to recover a plaintext across a network in a Bleichenbacher style attack. To achieve successful decryption an attacker would have to be able to send a large number of trial messages for decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5, RSA-OAEP, and RSASVE.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| libgcrypt |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2268271
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2268272
- https://bugzilla.redhat.com/show_bug.cgi?id=2268268
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2268268
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2274128
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2274129
- https://dev.gnupg.org/T7136
- https://gitlab.com/redhat-crypto/libgcrypt/libgcrypt-mirror/-/merge_requests/19
- https://access.redhat.com/errata/RHSA-2024:9404
- https://bugzilla.redhat.com/show_bug.cgi?id=2245218
- https://access.redhat.com/errata/RHSA-2025:3534
- https://access.redhat.com/security/cve/CVE-2024-2236
- https://access.redhat.com/errata/RHSA-2025:3530
Frequently Asked Questions
What is the severity of CVE-2024-2236?
CVE-2024-2236 is considered a high severity vulnerability due to its potential for plaintext recovery via a timing-based side-channel attack.
How do I fix CVE-2024-2236?
To fix CVE-2024-2236, update the GNU libgcrypt library to the latest patched version provided by the developers.
Who is affected by CVE-2024-2236?
CVE-2024-2236 affects users of the GNU libgcrypt library, specifically in its RSA implementation.
What type of attack does CVE-2024-2236 facilitate?
CVE-2024-2236 facilitates a Bleichenbacher-style attack that can lead to plaintext recovery.
Can CVE-2024-2236 be exploited remotely?
Yes, CVE-2024-2236 can potentially be exploited remotely if an attacker can send multiple trial messages across a network.
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