botan: CVE-2021-40529

Debian Bug report logs - #993840
botan: CVE-2021-40529

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: botan: CVE-2021-40529

Date: Tue, 07 Sep 2021 08:23:17 +0200

Source: botan
Version: 2.18.1+dfsg-2
Severity: important
Tags: security upstream
Forwarded: https://github.com/randombit/botan/pull/2790
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for botan.

CVE-2021-40529[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-40529
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40529
[1] https://github.com/randombit/botan/commit/9a23e4e3bc3966340531f2ff608fa9d33b5185a2
[2] https://github.com/randombit/botan/pull/2790

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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