SB2018103023 - Red Hat update for gnutls
Published: October 30, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2018-10844)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to usage of an insecure implementation of HMAC-SHA-256 algorithm vulnerable to a Lucky thirteen style attack. A remote attacker with ability to intercept traffic can recover encrypted data.
2) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2018-10845)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to usage of an insecure implementation of HMAC-SHA-384 algorithm vulnerable to a Lucky thirteen style attack. A remote attacker with ability to intercept traffic can recover encrypted data.
3) Cryptographic issues (CVE-ID: CVE-2018-10846)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a cache-based side channel in GnuTLS implementation that can lead to recovery of data in cross-VM attack setting. A remote attacker with ability to intercept traffic can recover encrypted data using a combination of "Just in Time" Prime+probe attack in combination with Lucky-13 attack.
Remediation
Install update from vendor's website.