It was found that GnuTLS's implementation of HMAC-SHA-256 was vulnerable to Lucky Thirteen-style attack. A remote attacker could use this flaw to conduct distinguishing attacks and plain text recovery attacks via statistical analysis of timing data using crafted packets.(CVE-2018-10844)

It was found that GnuTLS's implementation of HMAC-SHA-384 was vulnerable to a Lucky Thirteen-style attack. A remote attacker could use this flaw to conduct distinguishing attacks and plain text recovery attacks via statistical analysis of timing data using crafted packets.(CVE-2018-10845)

A cache-based side channel attack was found in the way GnuTLS implements CBC-mode cipher suites. An attacker could use a combination of 'Just in Time' Prime+probe and Lucky-13 attacks to recover plain text in a cross-VM attack scenario.(CVE-2018-10846)

This update for gnutls fixes the following issues :

Security issues fixed :

Improved mitigations against Lucky 13 class of attacks

  - 'Just in Time' PRIME + PROBE cache-based side channel     attack can lead to plaintext recovery (CVE-2018-10846,     bsc#1105460)

  - HMAC-SHA-384 vulnerable to Lucky thirteen attack due to     use of wrong constant (CVE-2018-10845, bsc#1105459)

  - HMAC-SHA-256 vulnerable to Lucky thirteen attack due to     not enough dummy function calls (CVE-2018-10844,     bsc#1105437)

The _asn1_check_identifier function in Libtasn1 caused a NULL pointer dereference and crash (CVE-2017-10790, bsc#1047002)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for gnutls fixes the following issues :

Security issues fixed :

  - Improved mitigations against Lucky 13 class of attacks

  - CVE-2018-10846: 'Just in Time' PRIME + PROBE cache-based     side channel attack can lead to plaintext recovery     (bsc#1105460)

  - CVE-2018-10845: HMAC-SHA-384 vulnerable to Lucky     thirteen attack due to use of wrong constant     (bsc#1105459)

  - CVE-2018-10844: HMAC-SHA-256 vulnerable to Lucky     thirteen attack due to not enough dummy function calls     (bsc#1105437)

  - CVE-2017-10790: The _asn1_check_identifier function in     Libtasn1 caused a NULL pointer dereference and crash     (bsc#1047002)

This update was imported from the SUSE:SLE-12-SP3:Update update project.

According to the version of the gnutls packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - gnutls: HMAC-SHA-256 vulnerable to Lucky thirteen     attack due to not enough dummy function calls     (CVE-2018-10844)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libtasn1: asn1_get_bit_der() can return negative bit length (CVE-2014-3468)

  - gnutls: HMAC-SHA-384 vulnerable to Lucky thirteen attack due to use of wrong constant (CVE-2018-10845)

  - The asn1_get_length_der function in decoding.c in GNU Libtasn1 before 2.12, as used in GnuTLS before     3.0.16 and other products, does not properly handle certain large length values, which allows remote     attackers to cause a denial of service (heap memory corruption and application crash) or possibly have     unspecified other impact via a crafted ASN.1 structure. (CVE-2012-1569)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

ID	名稱	產品	系列	已發布	已更新	嚴重性
119503	Amazon Linux 2 : gnutls (ALAS-2018-1120)	Nessus	Amazon Linux Local Security Checks	2018/12/10	2020/5/18	medium
117702	SUSE SLED12 / SLES12 Security Update : gnutls (SUSE-SU-2018:2842-1)	Nessus	SuSE Local Security Checks	2018/9/25	2022/3/25	medium
117792	openSUSE Security Update : gnutls (openSUSE-2018-1049)	Nessus	SuSE Local Security Checks	2018/9/27	2021/1/19	high
119933	EulerOS 2.0 SP2 : gnutls (EulerOS-SA-2018-1444)	Nessus	Huawei Local Security Checks	2018/12/28	2021/2/9	medium
198376	RHEL 6 : gnutls (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	2024/6/3	2024/6/3	medium

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