822009 – (CVE-2021-43398) dev-libs/crypto++: correlation between execution time and privkey length

Bug 822009 (CVE-2021-43398) - dev-libs/crypto++: correlation between execution time and privkey length

Summary: dev-libs/crypto++: correlation between execution time and privkey length

Status:	RESOLVED INVALID

Alias:	CVE-2021-43398

Product:	Gentoo Security
Classification:	Unclassified
Component:	Vulnerabilities (show other bugs)
Hardware:	All Linux

Importance:	Normal minor (vote)
Assignee:	Gentoo Security

URL:	https://github.com/weidai11/cryptopp/...
Whiteboard:	B4 [upstream]
Keywords:

Depends on:
Blocks:

Reported:	2021-11-05 20:40 UTC by John Helmert III
Modified:	2022-10-03 01:48 UTC (History)
CC List:	1 user (show)

See Also:
Package list:
Runtime testing required:	---

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Description John Helmert III archtester

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.

Comment 1 John Helmert III archtester

2022-10-03 01:48:25 UTC

"Hi Everyone,

We are going to close this a "not a bug". We believe it is expected behavior. We don't believe the CVE is valid.

@CindyZhouYH, if you can provide a test program and test data we would be happy to revisit it."

*shrug*