Covert Timing Channel in python-rsa - CVE-2020-25658
Published: March 7, 2023
Vulnerability identifier: #VU73108
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-25658
CWE-ID: CWE-385
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: sybrenstuvel
Affected software:
python-rsa
python-rsa
Detailed vulnerability description
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to a covert timing channel. A remote attacker can perform Bleichenbacher timing attack and decrypt parts of data via the RSA decryption API.
How to mitigate CVE-2020-25658
Install updates from vendor's website.
Sources
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-25658
- https://github.com/sybrenstuvel/python-rsa/issues/165
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APF364QJ2IYLPDNVFBOEJ24QP2WLVLJP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SAF67KDGSOHLVFTRDOHNEAFDRSSYIWA/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QY4PJWTYSOV7ZEYZVMYIF6XRU73CY6O7/