Vulnerability Monitor

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CVE-2021-40530

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.

Published

2021-09-06T19:15:07.673

Last Modified

2024-11-21T06:24:20.240

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.9 (MEDIUM)

CVSSv2 Vector

AV:N/AC:H/Au:N/C:P/I:N/A:N

Access Vector: NETWORK
Access Complexity: HIGH
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

4.9

Impact Score

2.9

Weaknesses

Type: Primary
CWE-327

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	cryptopp	crypto\+\+	≤ 8.5	Yes
Operating System	fedoraproject	fedora	33	Yes
Operating System	fedoraproject	fedora	34	Yes
Operating System	fedoraproject	fedora	35	Yes

References

https://eprint.iacr.org/2021/923 Technical Description, Third Party Advisory ([email protected])
https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1 Third Party Advisory ([email protected])
https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2 Exploit, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/57OJA2K5AHX5HAU2QBDRWLGIIUX7GASC/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGVBZ2TTRKCTYAZTRHTF6OBD4W37F5MT/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VJYOZGWI7TD27SEXILSM6VUTPPEICDL7/ ([email protected])
https://eprint.iacr.org/2021/923 Technical Description, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/57OJA2K5AHX5HAU2QBDRWLGIIUX7GASC/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGVBZ2TTRKCTYAZTRHTF6OBD4W37F5MT/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VJYOZGWI7TD27SEXILSM6VUTPPEICDL7/ (af854a3a-2127-422b-91ae-364da2661108)