SB2021111134 - Red Hat Enterprise Linux 8 update for gnutls and nettle
Published: November 11, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Input validation error (CVE-ID: CVE-2021-3580)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists in nettle's RSA decryption functions due to insufficient validation of certain ciphertexts. A remote attacker can send specially crafted data to the server and perform a denial of service (DoS) attack.
2) Use-after-free (CVE-ID: CVE-2021-20232)
The vulnerability allows a remote attacker to compromise vulnerable system.
The
vulnerability exists due to a use-after-free error in client_send_params in lib/ext/pre_shared_key.c. A remote attacker can trick the victim to connect
to a malicious server using a large Client Hello message over TLS 1.3,
trigger a use-after-free error and crash the application or execute
arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
3) Use-after-free (CVE-ID: CVE-2021-20231)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in client sending key_share extension. A remote attacker can trick the victim to connect to a malicious server using a large Client Hello message over TLS 1.3, trigger a use-after-free error and crash the application or execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
Remediation
Install update from vendor's website.