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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:Sep 6, 2021
    Last Modified:Nov 21, 2024
    EPS:Sep 6, 2021
    EPSS Score:0.00257
    CVSS Score:5.9

    Affected Products

    Vendor
    Cryptopp
    Product
    Crypto\+\+
    Vendor
    Fedoraproject
    Product
    Fedora

    Exploits

    https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2

    Related CVEs

    CVE-2024-28285 (CVSS 9.8) — A Fault Injection vulnerability in the SymmetricDecrypt function in cryptopp/elgamal.h of Cryptopp Crypto++ 8.…
    CVE-2023-50980 (CVSS 7.5) — gf2n.cpp in Crypto++ (aka cryptopp) through 8.9.0 allows attackers to cause a denial of service (application c…
    CVE-2023-50979 (CVSS 5.9) — Crypto++ (aka cryptopp) through 8.9.0 has a Marvin side channel during decryption with PKCS#1 v1.5 padding.…
    CVE-2023-50981 (CVSS 7.5) — ModularSquareRoot in Crypto++ (aka cryptopp) through 8.9.0 allows attackers to cause a denial of service (infi…
    CVE-2022-48570 (CVSS 7.5) — Crypto++ through 8.4 contains a timing side channel in ECDSA signature generation. Function FixedSizeAllocator…
    CVE-2021-43398 (CVSS 5.3) — Crypto++ (aka Cryptopp) 8.6.0 and earlier contains a timing leakage in MakePublicKey(). There is a clear corre…
    CVE-2019-14318 (CVSS 5.9) — Crypto++ 8.3.0 and earlier contains a timing side channel in ECDSA signature generation. This allows a local o…
    CVE-2017-9434 (CVSS 5.3) — Crypto++ (aka cryptopp) through 5.6.5 contains an out-of-bounds read vulnerability in zinflate.cpp in the Infl…
    CVE-2016-3995 (CVSS 7.5) — The timing attack protection in Rijndael::Enc::ProcessAndXorBlock and Rijndael::Dec::ProcessAndXorBlock in Cry…
    CVE-2016-7544 (CVSS 7.5) — Crypto++ 5.6.4 incorrectly uses Microsoft's stack-based _malloca and _freea functions. The library will reques…

    References

    https://eprint.iacr.org/2021/923
    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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/57OJA2K5AHX5HAU2QBDRWLGIIUX7GASC/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGVBZ2TTRKCTYAZTRHTF6OBD4W37F5MT/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VJYOZGWI7TD27SEXILSM6VUTPPEICDL7/
    https://eprint.iacr.org/2021/923
    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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/57OJA2K5AHX5HAU2QBDRWLGIIUX7GASC/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGVBZ2TTRKCTYAZTRHTF6OBD4W37F5MT/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VJYOZGWI7TD27SEXILSM6VUTPPEICDL7/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High