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.

The remote Redhat Enterprise Linux 5 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.

  - libgcrypt: PRNG output is predictable (CVE-2016-6313)

  - libgcrypt: Use of left-to-right sliding window method allows full RSA key recovery (CVE-2017-7526)

  - In Libgcrypt 1.8.4, the C implementation of AES is vulnerable to a flush-and-reload side-channel attack     because physical addresses are available to other processes. (The C implementation is used on platforms     where an assembly-language implementation is unavailable.) NOTE: the vendor's position is that the issue     report cannot be validated because there is no description of an attack (CVE-2019-12904)

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

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.

  - libgcrypt: Use of left-to-right sliding window method allows full RSA key recovery (CVE-2017-7526)

  - Libgcrypt: physical addresses being available to other processes leads to a flush-and-reload side-channel     attack (CVE-2019-12904)

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

The remote Redhat Enterprise Linux 7 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.

  - libgcrypt: Use of left-to-right sliding window method allows full RSA key recovery (CVE-2017-7526)

  - Libgcrypt: physical addresses being available to other processes leads to a flush-and-reload side-channel     attack (CVE-2019-12904)

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

According to the versions of the libgcrypt package installed, the EulerOS Virtualization 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)

  - Libgcrypt before 1.6.3 and GnuPG before 1.4.19 does not     implement ciphertext blinding for Elgamal decryption,     which allows physically proximate attackers to obtain     the server's private key by determining factors using     crafted ciphertext and the fluctuations in the     electromagnetic field during     multiplication.(CVE-2014-3591)

  - The mpi_powm function in Libgcrypt before 1.6.3 and     GnuPG before 1.4.19 allows attackers to obtain     sensitive information by leveraging timing differences     when accessing a pre-computed table during modular     exponentiation, related to a 'Last-Level Cache     Side-Channel Attack.'(CVE-2015-0837)

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.

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.

According to the versions of the libgcrypt packages installed, the EulerOS 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.

This update for libgcrypt fixes the following security issue :

  - CVE-2017-7526: Hardening against local side-channel     attack. (bsc#1046607)

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.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-3733-1 advisory.

    Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange,     Christine van Vredendaal, and Yuval Yarom discovered that GnuPG is vulnerable to a cache side-channel     attack. A local attacker could use this attack to recover RSA 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.

GnuPG reports :

GnuPG did not sanitize input file names, which may then be output to the terminal. This could allow terminal control sequences or fake status messages to be injected into the output.

Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal and Yuval Yarom discovered that GnuPG is prone to a local side-channel attack allowing full key recovery for RSA-1024.

See https://eprint.iacr.org/2017/627 for details.

Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal and Yuval Yarom discovered that gnupg is prone to a local side-channel attack allowing full key recovery for RSA-1024.

See https://eprint.iacr.org/2017/627 for details.

For Debian 7 'Wheezy', these problems have been fixed in version 1.4.12-7+deb7u9.

We recommend that you upgrade your gnupg 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.

New gnupg packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix a security issue.

New upstream release fixing moderate security issue CVE-2017-7526.

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

This update for libgcrypt fixes the following issues :

  - CVE-2017-7526: Hardening against a local side-channel     attack in RSA key handling has been added (bsc#1046607)

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

This update for libgcrypt fixes the following issues :

  - CVE-2017-7526: Hardening against a local side-channel     attack in RSA key handling has been added (bsc#1046607)

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 libgcrypt fixes the following issues :

  - CVE-2017-7526: Hardening a against local side-channel     attack in RSA key handling has been added (bsc#1046607)

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.

It was discovered that there was a key disclosure vulnerability in libgcrypt11 a library of cryptographic routines :

It is well known that constant-time implementations of modular exponentiation cannot use sliding windows. However, software libraries such as Libgcrypt, used by GnuPG, continue to use sliding windows. It is widely believed that, even if the complete pattern of squarings and multiplications is observed through a side-channel attack, the number of exponent bits leaked is not sufficient to carry out a full key-recovery attack against RSA. Specifically, 4-bit sliding windows leak only 40% of the bits, and 5-bit sliding windows leak only 33% of the bits.

-- Sliding right into disaster: Left-to-right sliding windows leak <https://eprint.iacr.org/2017/627>

For Debian 7 'Wheezy', this issue has been fixed in libgcrypt11 version 1.5.0-5+deb7u6.

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.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3347-1 advisory.

    Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange,     Christine van Vredendaal, and Yuval Yarom discovered that Libgcrypt was susceptible to an attack via side     channels. A local attacker could use this attack to recover RSA private keys. (CVE-2017-7526)

    It was discovered that Libgcrypt was susceptible to an attack via side channels. A local attacker could     use this attack to possibly recover EdDSA private keys. This issue only applied to Ubuntu 16.04 LTS,     Ubuntu 16.10 and Ubuntu 17.04. (CVE-2017-9526)

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

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

GnuPG reports :

Mitigate a flush+reload side-channel attack on RSA secret keys dubbed 'Sliding right into disaster'.

Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal and Yuval Yarom discovered that Libgcrypt is prone to a local side-channel attack allowing full key recovery for RSA-1024.

See https://eprint.iacr.org/2017/627 for details.

New libgcrypt packages are available for Slackware 14.2 and -current to fix a security issue.

ID	Name	Product	Family	Severity
199239	RHEL 5 : libgcrypt (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	medium
199174	RHEL 6 : libgcrypt (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	medium
199144	RHEL 7 : libgcrypt (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	medium
135660	EulerOS Virtualization 3.0.2.2 : libgcrypt (EulerOS-SA-2020-1498)	Nessus	Huawei Local Security Checks	medium
134478	EulerOS Virtualization for ARM 64 3.0.2.0 : libgcrypt (EulerOS-SA-2020-1189)	Nessus	Huawei Local Security Checks	medium
130667	EulerOS 2.0 SP5 : libgcrypt (EulerOS-SA-2019-2205)	Nessus	Huawei Local Security Checks	medium
129199	EulerOS 2.0 SP3 : libgcrypt (EulerOS-SA-2019-2006)	Nessus	Huawei Local Security Checks	medium
126877	EulerOS 2.0 SP2 : libgcrypt (EulerOS-SA-2019-1750)	Nessus	Huawei Local Security Checks	medium
120001	SUSE SLES12 Security Update : compat-libgcrypt11 (SUSE-SU-2017:1866-1)	Nessus	SuSE Local Security Checks	medium
111581	Ubuntu 14.04 LTS / 16.04 LTS : GnuPG vulnerability (USN-3733-1)	Nessus	Ubuntu Local Security Checks	medium
110430	FreeBSD : gnupg -- unsanitized output (CVE-2018-12020) (7da0417f-6b24-11e8-84cc-002590acae31)	Nessus	FreeBSD Local Security Checks	high
102927	Debian DSA-3960-1 : gnupg - security update	Nessus	Debian Local Security Checks	medium
102888	Debian DLA-1080-1 : gnupg security update	Nessus	Debian Local Security Checks	medium
102133	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : gnupg (SSA:2017-213-01)	Nessus	Slackware Local Security Checks	medium
101861	Fedora 24 : libgcrypt (2017-3b70d0b976)	Nessus	Fedora Local Security Checks	medium
101589	Fedora 26 : libgcrypt (2017-22107b1986)	Nessus	Fedora Local Security Checks	medium
101346	openSUSE Security Update : libgcrypt (openSUSE-2017-796)	Nessus	SuSE Local Security Checks	medium
101292	SUSE SLED12 / SLES12 Security Update : libgcrypt (SUSE-SU-2017:1794-1)	Nessus	SuSE Local Security Checks	medium
101291	SUSE SLES11 Security Update : libgcrypt (SUSE-SU-2017:1793-1)	Nessus	SuSE Local Security Checks	medium
101274	Debian DLA-1015-1 : libgcrypt11 security update	Nessus	Debian Local Security Checks	medium
101231	Ubuntu 14.04 LTS / 16.04 LTS : Libgcrypt vulnerabilities (USN-3347-1)	Nessus	Ubuntu Local Security Checks	medium
101215	Fedora 25 : libgcrypt (2017-a348b32eb5)	Nessus	Fedora Local Security Checks	medium
101188	FreeBSD : libgcrypt -- side-channel attack on RSA secret keys (ed3bf433-5d92-11e7-aa14-e8e0b747a45a)	Nessus	FreeBSD Local Security Checks	medium
101176	Debian DSA-3901-1 : libgcrypt20 - security update	Nessus	Debian Local Security Checks	medium
101118	Slackware 14.2 / current : libgcrypt (SSA:2017-180-04)	Nessus	Slackware Local Security Checks	medium

Detections

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CVE-2017-7526

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