CVE-2018-6594

lib/Crypto/PublicKey/ElGamal.py in PyCrypto through 2.6.1 generates weak ElGamal key parameters, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for PyCrypto's ElGamal implementation.

CVSS v3.0 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

Vector : AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:P/I:N/A:N

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

References

Link	Resource
https://github.com/TElgamal/attack-on-pycrypto-elgamal	Third Party Advisory
https://github.com/dlitz/pycrypto/issues/253	Exploit Issue Tracking Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00018.html	Mailing List Third Party Advisory
https://usn.ubuntu.com/3616-1/	Third Party Advisory
https://usn.ubuntu.com/3616-2/	Third Party Advisory
https://security.gentoo.org/glsa/202007-62

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Configurations

Configuration 1 (hide)

cpe:2.3:a:dlitz:pycrypto:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

Configuration 3 (hide)

OR	cpe:2.3:o:canonical:ubuntu_linux:12.04::::esm:::
	cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:17.10:::::::*

Information

Published : 2018-02-03 07:29

Updated : 2020-07-31 12:15

NVD link : CVE-2018-6594

Mitre link : CVE-2018-6594

JSON object : View

CWE

CWE-326

Inadequate Encryption Strength

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Products Affected

debian

debian_linux

canonical

ubuntu_linux

dlitz

pycrypto

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