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Bug 811912 - mail-client/thunderbird: ElGamal plaintext recovery via bundled dev-libs/botan (CVE-2021-40529)
Summary: mail-client/thunderbird: ElGamal plaintext recovery via bundled dev-libs/bota...
Status: CONFIRMED
Alias: None
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
URL:
Whiteboard: B4 [upstream]
Keywords:
Depends on:
Blocks: CVE-2021-40529
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Reported: 2021-09-07 01:36 UTC by John Helmert III
Modified: 2021-09-07 01:38 UTC (History)
1 user (show)

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


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Description John Helmert III gentoo-dev Security 2021-09-07 01:36:01 UTC
CVE-2021-40529:

The ElGamal implementation in Botan through 2.18.1, as used in Thunderbird and other products, allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.


Unreleased in Botan (https://github.com/randombit/botan/pull/2790), and doesn't seem the patch is in Thunderbird yet.