CVE-2021-40529

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Summary

CVECVE-2021-40529
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-09-06 19:15:00 UTC
Updated2023-11-07 03:38:00 UTC
DescriptionThe 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.

Risk And Classification

Problem Types: CWE-327

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Botan Project Botan All All All All
Operating System Fedoraproject Fedora 34 All All All
Operating System Fedoraproject Fedora 35 All All All
Application Mozilla Thunderbird All All All All

References

ReferenceSourceLinkTags
Cryptology ePrint Archive: Report 2021/923 - On the (in)security of ElGamal in OpenPGP MISC eprint.iacr.org
Avoid using short exponents with ElGamal by randombit · Pull Request #2790 · randombit/botan · GitHub MISC github.com
On the (in)security of ElGamal in OpenPGP - Part II - Syssec@IBM Research MISC ibm.github.io
Mozilla Thunderbird: Multiple Vulnerabilities (GLSA 202208-14) — Gentoo security GENTOO security.gentoo.org
[SECURITY] Fedora 34 Update: botan2-2.17.3-4.fc34 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
On the (in)security of ElGamal in OpenPGP - Part I - Syssec@IBM Research MISC ibm.github.io
[SECURITY] Fedora 35 Update: botan2-2.18.2-1.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 34 Update: botan2-2.17.3-4.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 35 Update: botan2-2.18.2-1.fc35 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 181906 Debian Security Update for botan (CVE-2021-40529)
  • 282059 Fedora Security Update for botan2 (FEDORA-2021-8d51cac49f)
  • 501731 Alpine Linux Security Update for botan
  • 501949 Alpine Linux Security Update for botan
  • 503874 Alpine Linux Security Update for botan
  • 710585 Gentoo Linux Mozilla Thunderbird Multiple Vulnerabilities (GLSA 202208-14)
  • 751542 OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2021:4150-1)
  • 751566 OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2021:1635-1)
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