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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. References: https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1 https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2 https://eprint.iacr.org/2021/923 Upstream patch: https://github.com/randombit/botan/pull/2790
Created botan tracking bugs for this issue: Affects: epel-7 [bug 2002828] Affects: fedora-all [bug 2002826] Created botan2 tracking bugs for this issue: Affects: epel-8 [bug 2002829] Affects: fedora-all [bug 2002827]
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.