SB2023042608 - Ubuntu update for openssl
Published: April 26, 2023
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Improper locking (CVE-ID: CVE-2022-3996)
The vulnerability allows a remote attacker to perform a denial of service attack (DoS).
The vulnerability exists due to double-locking error if an X.509 certificate contains a malformed policy constraint and policy processing is enabled. A remote attacker can under certain circumstances perform a denial of service attack against the web server.
Successful exploitation of the vulnerability requires that policy processing being enabled on the server.
2) Resource exhaustion (CVE-ID: CVE-2023-0464)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources when verifying X.509 certificate chains that include policy constraints. A remote attacker can create a specially crafted certificate to trigger resource exhaustion and perform a denial of service (DoS) attack.
3) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2023-0465)
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to an error when validating certificate policies in leaf certificates. A remote attacker that controls a malicious CA server can issue a certificate that will be validated by the application.
4) Security features bypass (CVE-ID: CVE-2023-0466)
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to an error within the X509_VERIFY_PARAM_add0_policy() function, which does not perform the certificate policy check despite being implicitly enabled. A remote attacker can bypass expected security restrictions and perform MitM attack.
Remediation
Install update from vendor's website.