SB2023050451 - Red Hat Enterprise Linux 8 update for libreswan
Published: May 4, 2023
Security Bulletin ID
SB2023050451
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2023-30570)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incorrect handling of unsupported algorithms (such as DH2) when processing IKEv1 Aggressive Mode packets in libreswan pluto daemon. A remote attacker can send a specially crafted IKEv1 Aggressive Mode packet to the daemon and crash it.
Successful exploitation of the vulnerability requires that the libreswan pluto daemon is configured explicitly with "aggressive=yes" (or "aggrmode=yes") and accepts IKEv1 packets.
Remediation
Install update from vendor's website.