Vulnerability Description
The ElGamal implementation in Crypto++ through 8.5 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cryptopp | Crypto\+\+ | <= 8.5 |
| Fedoraproject | Fedora | 33 |
Related Weaknesses (CWE)
References
- https://eprint.iacr.org/2021/923Technical DescriptionThird Party Advisory
- https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgThird Party Advisory
- https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgExploitThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://eprint.iacr.org/2021/923Technical DescriptionThird Party Advisory
- https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgThird Party Advisory
- https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgExploitThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2021-40530?
CVE-2021-40530 is a vulnerability with a CVSS score of 5.9 (MEDIUM). The ElGamal implementation in Crypto++ through 8.5 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by th...
How severe is CVE-2021-40530?
CVE-2021-40530 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-40530?
Check the references section above for vendor advisories and patch information. Affected products include: Cryptopp Crypto\+\+, Fedoraproject Fedora.