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)

A set of vulnerabilities was discovered in GnuTLS which allowed attackers to do plain text recovery on TLS connections with certain cipher types.

CVE-2018-10844

It was found that the GnuTLS implementation of HMAC-SHA-256 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data using crafted packets.

CVE-2018-10845

It was found that the GnuTLS implementation of HMAC-SHA-384 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plain text recovery attacks via statistical analysis of timing data using crafted packets.

CVE-2018-10846

A cache-based side channel in GnuTLS implementation that leads to plain text recovery in cross-VM attack setting was found. An attacker could use a combination of 'Just in Time' Prime+probe attack in combination with Lucky-13 attack to recover plain text using crafted packets.

For Debian 8 'Jessie', these problems have been fixed in version 3.3.30-0+deb8u1. It was found to be more practical to update to the latest upstream version of the 3.3.x branch since upstream's fixes were rather invasive and required cipher list changes anyways. This will facilitate future LTS updates as well.

This change therefore also includes the following major policy changes, as documented in the NEWS file :

  - ARCFOUR (RC4) and SSL 3.0 are no longer included in the     default priorities list. Those have to be explicitly     enabled, e.g., with a string like 'NORMAL:+ARCFOUR-128'     or 'NORMAL:+VERS-SSL3.0', respectively.

  - The ciphers utilizing HMAC-SHA384 and SHA256 have been     removed from the default priority strings. They are not     necessary for compatibility or other purpose and provide     no advantage over their SHA1 counter-parts, as they all     depend on the legacy TLS CBC block mode.

  - Follow closely RFC5280 recommendations and use UTCTime     for dates prior to 2050.

  - Require strict DER encoding for certificates, OCSP     requests, private keys, CRLs and certificate requests,     in order to reduce issues due to the complexity of BER     rules.

  - Refuse to import v1 or v2 certificates that contain     extensions.

API and ABI compatibility is retained, however, although new symbols have been added. Many bugfixes are also included in the upload. See the provided upstream changelog for more details.

We recommend that you upgrade your gnutls28 packages and do not expect significant breakage.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA 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

  - '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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A cache-based side channel in GnuTLS implementation that leads to plain text recovery in cross-VM attack     setting was found. An attacker could use a combination of Just in Time Prime+probe attack in combination     with Lucky-13 attack to recover plain text using crafted packets. (CVE-2018-10846)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
119503	Amazon Linux 2 : gnutls (ALAS-2018-1120)	Nessus	Amazon Linux Local Security Checks	2018/12/10	2024/7/16	medium
118504	Debian DLA-1560-1 : gnutls28 security update	Nessus	Debian Local Security Checks	2018/10/31	2024/7/26	medium
117702	SUSE SLED12 / SLES12 Security Update : gnutls (SUSE-SU-2018:2842-1)	Nessus	SuSE Local Security Checks	2018/9/25	2024/8/5	medium
117792	openSUSE Security Update : gnutls (openSUSE-2018-1049)	Nessus	SuSE Local Security Checks	2018/9/27	2024/8/1	medium
221527	Linux Distros Unpatched Vulnerability : CVE-2018-10846	Nessus	Misc.	2025/3/4	2025/9/3	medium

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