Bug 2020536 (CVE-2021-43398) - CVE-2021-43398 cryptopp: a timing leakage may lead to information disclosure
Summary: CVE-2021-43398 cryptopp: a timing leakage may lead to information disclosure
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-43398
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2020537 2020538
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-11-05 08:37 UTC by Marian Rehak
Modified: 2022-01-03 14:23 UTC (History)
4 users (show)

Fixed In Version:
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Last Closed: 2021-11-05 09:09:24 UTC
Embargoed:

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Description Marian Rehak 2021-11-05 08:37:57 UTC 
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.

Upstream Issue:

https://github.com/weidai11/cryptopp/issues/1080
Comment 1 Marian Rehak 2021-11-05 08:38:14 UTC 
Created cryptopp tracking bugs for this issue:

Affects: epel-all [bug 2020538]
Affects: fedora-all [bug 2020537]
Comment 2 Product Security DevOps Team 2021-11-05 09:09:23 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
Comment 3 Nicolas Chauvet (kwizart) 2022-01-03 14:23:01 UTC 
FY Upstream as closed this as notabug
https://github.com/weidai11/cryptopp/issues/1080#issuecomment-996527355

As "key lengh value" isn't a sensible information as I understand.
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