Information Exposure Through Timing Discrepancy in M2Crypto - CVE-2020-25657

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Main Vulnerability Database Vulnerabilities #VU65771

Information Exposure Through Timing Discrepancy in M2Crypto - CVE-2020-25657

Published: July 26, 2022 / Updated: February 18, 2025


Vulnerability identifier: #VU65771
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-25657
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.


Affected software

M2Crypto
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE CaaS Platform
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Storage
SUSE OpenStack Cloud Crowbar
SUSE OpenStack Cloud
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Public Cloud
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Desktop
SUSE Linux Enterprise Module for Python2
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Server 15 SP4 LTSS
SUSE Linux Enterprise Desktop 15 SP4 LTSS
Python 3 Module
Basesystem Module
openSUSE Leap
openEuler
python-M2Crypto-debuginfo
python-M2Crypto-debugsource
python3-M2Crypto
python3-M2Crypto-debuginfo
python-M2Crypto
m2crypto
m2crypto-debuginfo
python3-m2crypto
m2crypto-debugsource
python2-M2Crypto
python2-M2Crypto-debuginfo
python-M2Crypto-doc
python311-M2Crypto-debuginfo
python311-M2Crypto
python3-M2Crypto-doc
Dell EMC VxRail Appliance

How to mitigate CVE-2020-25657

Install update from vendor's website.

M2Crypto - update to 0.39.0
python-M2Crypto-debuginfo - addressed in versions 0.29.0-23.8.1, 0.35.2-150000.3.14.1
python-M2Crypto-debugsource - addressed in versions 0.29.0-23.8.1, 0.35.2-150000.3.14.1, 0.38.0-150400.3.3.1, 0.38.0-150400.3.6.1, 0.40.0-150400.3.9.1
python3-M2Crypto - addressed in versions 0.29.0-23.8.1, 0.35.2-150000.3.14.1, 0.38.0-150400.3.3.1, 0.38.0-150400.3.6.1, 0.44.0-150400.13.1, 0.44.0-150600.19.3.1
python3-M2Crypto-debuginfo - addressed in versions 0.29.0-23.8.1, 0.35.2-150000.3.14.1, 0.38.0-150400.3.3.1, 0.38.0-150400.3.6.1, 0.44.0-150400.13.1, 0.44.0-150600.19.3.1
python-M2Crypto - update to 0.29.0-23.8.1
m2crypto - update to 0.30.1-5
m2crypto-debuginfo - update to 0.30.1-5
python3-m2crypto - update to 0.30.1-5
m2crypto-debugsource - update to 0.30.1-5
python2-M2Crypto - update to 0.35.2-150000.3.14.1
python2-M2Crypto-debuginfo - update to 0.35.2-150000.3.14.1
python-M2Crypto-doc - addressed in versions 0.35.2-150000.3.14.1, 0.38.0-150400.3.3.1, 0.38.0-150400.3.6.1, 0.40.0-150400.3.9.1
python311-M2Crypto-debuginfo - update to 0.40.0-150400.3.9.1
python311-M2Crypto - update to 0.40.0-150400.3.9.1
python3-M2Crypto-doc - addressed in versions 0.44.0-150400.13.1, 0.44.0-150600.19.3.1
Dell EMC VxRail Appliance - update to 8.0.000

External References

Related Security Bulletins