Information Exposure Through Timing Discrepancy in M2Crypto - CVE-2023-50781

Detailed vulnerability description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to possibility of the Bleichenbacher timing attack in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. A remote attacker can gain access to sensitive information.

Note, the vulnerability exists due ti incomplete fix for #VU65771 (CVE-2020-25657).

How to mitigate CVE-2023-50781

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

The vulnerability is partially solved with OpenSSL update if the default provider is in use (e.g. won't help with pkcs11 provider).

Sources

• https://access.redhat.com/security/cve/CVE-2023-50781
• https://bugzilla.redhat.com/show_bug.cgi?id=2254426