Bug 1217842 (CVE-2023-45287)

Summary: VUL-0: CVE-2023-45287: go,go1.19,go1.20,go1.21: RSA blinding was applied to prevent timing attacks, but analysis shows this may not have been fully effective
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: RESOLVED FIXED QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: abergmann
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/387155/
Whiteboard:
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2023-12-06 08:45:09 UTC 
Before Go 1.20, the RSA based TLS key exchanges used the math/big library, which is not constant time. RSA blinding was applied to prevent timing attacks, but analysis shows this may not have been fully effective. In particular it appears as if the removal of PKCS#1 padding may leak timing information, which in turn could be used to recover session key bits. In Go 1.20, the crypto/tls library switched to a fully constant time RSA implementation, which we do not believe exhibits any timing side channels.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-45287
Comment 1 Alexander Bergmann 2023-12-06 10:50:05 UTC 
This issue was already fixed within previous releases.

Closing bug as fixed.