Use of insufficiently random values in keypair - CVE-2021-41117
Published: October 13, 2021 / Updated: August 16, 2024
Vulnerability identifier: #VU57321
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2021-41117
CWE-ID: CWE-330
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: Julian Gruber
Affected software:
keypair
keypair
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to an error in the pseudo-random number generator used by keypair to generate RSA keys for SSH connections. A remote attacker can generate duplicate SSH keys and gain unauthorized access to the affected systems.
How to mitigate CVE-2021-41117
Install updates from vendor's website.
Note, just installing an update is not enough to fix the problem. You need to replace all previously generated SSH keys.