Information Exposure Through Timing Discrepancy in M2Crypto - CVE-2023-50781
Published: February 18, 2025
Vulnerability identifier: #VU104032
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-50781
CWE-ID: CWE-208
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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).
Affected software
M2Crypto
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).