Eyal Ronen、Kenneth G. Paterson 和 Adi Shamir 发现 GnuTLS 容易受到名为“Lucky Thirteen”问题的时序边信道攻击。远程攻击者可利用此问题，通过定时数据分析执行明文恢复攻击。此问题仅影响 Ubuntu 16.04 LTS 和 Ubuntu 18.04 LTS。
（CVE-2018-10844、CVE-2018-10845、CVE-2018-10846）

Tavis Ormandy 发现，验证特定 X.509 凭证时，GnuTLS 未正确处理内存。远程攻击者可以利用此问题造成 GnuTLS 崩溃，从而导致拒绝服务或执行任意代码。此问题仅影响 Ubuntu 18.04 LTS、Ubuntu 18.10 和 Ubuntu 19.04。(CVE-2019-3829)

发现 GnuTLS 未能正确处理某些 post-handshake 消息。远程攻击者可以利用此问题造成 GnuTLS 崩溃，从而导致拒绝服务或执行任意代码。此问题仅影响 Ubuntu 18.10 和 Ubuntu 19.04。(CVE-2019-3836)

请注意，Tenable Network Security 已直接从 Ubuntu 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下，尽可能进行自动清理和排版。

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

  - 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-2018-10844)

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

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.

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.

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.

ID	Name	Product	Family	Published	Updated	Severity
125622	Ubuntu 16.04 LTS / 18.04 LTS：GnuTLS 漏洞 (USN-3999-1)	Nessus	Ubuntu Local Security Checks	5/31/2019	9/3/2025	medium
119933	EulerOS 2.0 SP2 : gnutls (EulerOS-SA-2018-1444)	Nessus	Huawei Local Security Checks	12/28/2018	7/12/2024	medium
221500	Linux Distros Unpatched Vulnerability : CVE-2018-10844	Nessus	Misc.	3/4/2025	9/3/2025	medium
117792	openSUSE Security Update : gnutls (openSUSE-2018-1049)	Nessus	SuSE Local Security Checks	9/27/2018	8/1/2024	medium
118504	Debian DLA-1560-1 : gnutls28 security update	Nessus	Debian Local Security Checks	10/31/2018	7/26/2024	medium
119503	Amazon Linux 2 : gnutls (ALAS-2018-1120)	Nessus	Amazon Linux Local Security Checks	12/10/2018	7/16/2024	medium
117702	SUSE SLED12 / SLES12 Security Update : gnutls (SUSE-SU-2018:2842-1)	Nessus	SuSE Local Security Checks	9/25/2018	8/5/2024	medium

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