SB2018100102 - OpenSUSE Linux update for gnutls

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Null pointer dereference (CVE-ID: CVE-2017-10790)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the _asn1_check_identifier function in GNU Libtasn1 due to insufficient validation of user-supplied input. A remote attacker can submit a specially crafted input, trigger assignment of a NULL value within an asn1_node structure and cause the service to crash.

2) 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.

3) 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.

4) 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.

References

• https://lists.opensuse.org/opensuse-security-announce/2018-10/msg00000.html