Expired pointer dereference in strongSwan - CVE-2023-26463
Published: August 18, 2023
Vulnerability identifier: #VU79677
CSH Severity: High
CVSS v4: 9.3 [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]
CVE-ID: CVE-2023-26463
CWE-ID: CWE-825
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to an error in libtls implementation that treats the public key from the peer's certificate as trusted, even if the certificate can't be verified successfully. A remote attacker can supply a self-signed certificate to a server that authenticates clients with a TLS-based EAP method like EAP-TLS, trigger an expired pointer dereference and crash the server or execute arbitrary code.
Affected software
strongSwan
Gentoo Linux
Fedora
net-vpn/strongswan
strongswan
Gentoo Linux
Fedora
net-vpn/strongswan
strongswan
How to mitigate CVE-2023-26463
Install updates from vendor's website.
strongSwan - update to 5.9.10
net-vpn/strongswan - update to 5.9.10
strongswan - addressed in versions 5.9.10-1.el8, 5.9.10-1.el9, 5.9.10-1.fc37, 5.9.10-1.fc38, 5.9.14-5.el10_0
net-vpn/strongswan - update to 5.9.10
strongswan - addressed in versions 5.9.10-1.el8, 5.9.10-1.el9, 5.9.10-1.fc37, 5.9.10-1.fc38, 5.9.14-5.el10_0