The remote Ubuntu 14.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-2339-2 advisory.

    Daniel Genkin, Adi Shamir, and Eran Tromer discovered that Libgcrypt was susceptible to an adaptive chosen     ciphertext attack via physical side channels. A local attacker could use this attack to possibly recover     private keys.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Daniel Genkin, Itamar Pipman and Eran Tromer discovered that Elgamal encryption subkeys in applications using the libgcrypt11 library, for example GnuPG 2.x, could be leaked via a side-channel attack (see http://www.cs.tau.ac.il/~tromer/handsoff/).

This is fixed in Squeeze in version 1.4.5-2+squeeze2.

We recommend that you upgrade your libgcrypt11 packages.

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.

According to the versions of the libgcrypt package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - Libgcrypt before 1.5.4, as used in GnuPG and other     products, does not properly perform ciphertext     normalization and ciphertext randomization, which makes     it easier for physically proximate attackers to conduct     key-extraction attacks by leveraging the ability to     collect voltage data from exposed metal, a different     vector than CVE-2013-4576.(CVE-2014-5270)

  - libgcrypt before version 1.7.8 is vulnerable to a cache     side-channel attack resulting into a complete break of     RSA-1024 while using the left-to-right method for     computing the sliding-window expansion. The same attack     is believed to work on RSA-2048 with moderately more     computation. This side-channel requires that attacker     can run arbitrary software on the hardware where the     private RSA key is used.(CVE-2017-7526)

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 host is affected by the vulnerability described in GLSA-201408-10 (Libgcrypt: Side-channel attack)

    A vulnerability in the implementation of ElGamal decryption procedures       of Libgcrypt leaks information to various side-channels.
  Impact :

    A physical side-channel attack allows a remote attacker to fully extract       decryption keys during the decryption of a chosen ciphertext.
  Workaround :

    There is no known workaround at this time.

Updated gnupg, gnupg2 and libgcrypt packages fix security vulnerabilities :

GnuPG versions before 1.4.17 and 2.0.24 are vulnerable to a denial of service which can be caused by garbled compressed data packets which may put gpg into an infinite loop (CVE-2014-4617).

The libgcrypt library before version 1.5.4 is vulnerable to an ELGAMAL side-channel attack (CVE-2014-5270).

GnuPG before 1.4.19 is vulnerable to a side-channel attack which can potentially lead to an information leak (CVE-2014-3591).

GnuPG before 1.4.19 is vulnerable to a side-channel attack on data-dependent timing variations in modular exponentiation, which can potentially lead to an information leak (CVE-2015-0837).

The gnupg and gnupg2 package has been patched to correct these issues.

GnuPG2 is vulnerable to these issues through the libgcrypt library.
The issues were fixed in libgcrypt 1.6.3. The libgcrypt package in Mandriva, at version 1.5.4, was only vulnerable to the CVE-2014-3591 issue. It has also been patched to correct this issue.

This libgcrypt update fixes the following security issue :

  - Side-channel attack on Elgamal encryption subkeys.
    (CVE-2014-5270). (bnc#892464)

Genkin, Pipman and Tromer discovered a side-channel attack on Elgamal encryption subkeys (CVE-2014-5270 ).

In addition, this update hardens GnuPG's behaviour when treating keyserver responses; GnuPG now filters keyserver responses to only accepts those keyid's actually requested by the user.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
77527	Ubuntu 14.04 LTS : Libgcrypt vulnerability (USN-2339-2)	Nessus	Ubuntu Local Security Checks	2014/9/4	2024/8/27	high
82238	Debian DLA-93-1 : libgcrypt11 security update	Nessus	Debian Local Security Checks	2015/3/26	2021/1/11	low
134478	EulerOS Virtualization for ARM 64 3.0.2.0 : libgcrypt (EulerOS-SA-2020-1189)	Nessus	Huawei Local Security Checks	2020/3/13	2025/2/21	medium
77454	GLSA-201408-10 : Libgcrypt: Side-channel attack	Nessus	Gentoo Local Security Checks	2014/8/30	2021/1/6	low
82407	Mandriva Linux Security Advisory : gnupg (MDVSA-2015:154)	Nessus	Mandriva Local Security Checks	2015/3/30	2021/1/14	medium
77472	SuSE 11.3 Security Update : libgcrypt (SAT Patch Number 9646)	Nessus	SuSE Local Security Checks	2014/9/2	2021/1/19	low
77671	Debian DSA-3024-1 : gnupg - security update	Nessus	Debian Local Security Checks	2014/9/14	2021/1/11	low

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