5.9

CVE-2021-40529

Exploit
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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Botan Project ≫ Botan Version <= 2.18.1
Fedoraproject ≫ Fedora Version34
Fedoraproject ≫ Fedora Version35
Mozilla ≫ Thunderbird Version < 91.12.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.53% 0.716
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.9 2.2 3.6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd@nist.gov 2.6 4.9 2.9
AV:N/AC:H/Au:N/C:P/I:N/A:N
CWE-327 Use of a Broken or Risky Cryptographic Algorithm

The product uses a broken or risky cryptographic algorithm or protocol.

https://security.gentoo.org/glsa/202208-14
Third Party Advisory
https://eprint.iacr.org/2021/923
Third Party Advisory
Technical Description
https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1
Third Party Advisory
https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2
Third Party Advisory
Exploit
https://github.com/randombit/botan/pull/2790
Patch
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/72NB4OLD3VHJC3YF3PEP2HKF6BYURPAO/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPHGYWNJQKWLTUWBNSFB4F66MQDIL3IB/