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Bug 822009 (CVE-2021-43398)

Summary: dev-libs/crypto++: correlation between execution time and privkey length
Product: Gentoo Security Reporter: John Helmert III <ajak>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Status: CONFIRMED ---    
Severity: minor CC: sam
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
URL: https://github.com/weidai11/cryptopp/issues/1080
Whiteboard: B4 [upstream]
Package list:
Runtime testing required: ---

Description John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2021-11-05 20:40:28 UTC
CVE-2021-43398:

Crypto++ (aka Cryptopp) 8.6.0 and earlier contains a timing leakage in MakePublicKey(). There is a clear correlation between execution time and private key length, which may cause disclosure of the length information of the private key. This might allow attackers to conduct timing attacks.