CVE-2024-3296: Rust-openssl: timing based side-channel can lead to a bleichenbacher style attack

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-04 · updated 2026-06-17
Weakness: CWE-208

Description

A timing-based side-channel flaw exists in the rust-openssl package, 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 the legacy PKCS#1v1.5 RSA encryption padding mode.

References

https://access.redhat.com/security/cve/CVE-2024-3296
https://bugzilla.redhat.com/show_bug.cgi?id=2269723
https://access.redhat.com/security/cve/CVE-2024-3296
https://bugzilla.redhat.com/show_bug.cgi?id=2269723

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