GnuPG before 1.4.14, and Libgcrypt before 1.5.3 as used in GnuPG 2.0.x and possibly other products, allows local users to obtain private RSA keys via a cache side-channel attack involving the L3 cache, aka Flush+Reload.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - fix CVE-2013-4242 GnuPG/libgcrypt susceptible to cache     side-channel attack

  - Add GCRYCTL_SET_ENFORCED_FIPS_FLAG command

GnuPG before 1.4.14, and Libgcrypt before 1.5.3 as used in GnuPG 2.0.x and possibly other products, allows local users to obtain private RSA keys via a cache side-channel attack involving the L3 cache, aka Flush+Reload. (CVE-2013-4242)

The remote Solaris system is missing necessary patches to address security updates :

  - GnuPG before 1.4.14, and Libgcrypt before 1.5.3 as used     in GnuPG 2.0.x and possibly other products, allows local     users to obtain private RSA keys via a cache     side-channel attack involving the L3 cache, aka     Flush+Reload. (CVE-2013-4242)

The remote host is affected by the vulnerability described in GLSA-201402-24 (GnuPG, Libgcrypt: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in GnuPG and Libgcrypt.
      Please review the CVE identifiers referenced below for details.
  Impact :

    An unauthenticated remote attacker may be able to execute arbitrary code       with the privileges of the user running GnuPG, cause a Denial of Service       condition, or bypass security restrictions. Additionally, a side-channel       attack may allow a local attacker to recover a private key, please review       &ldquo;Flush+Reload: a High Resolution, Low Noise, L3 Cache Side-Channel       Attack&rdquo; in the References section for further details.
  Workaround :

    There is no known workaround at this time.

An updated gnupg package that fixes multiple security issues is now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The GNU Privacy Guard (GnuPG or GPG) is a tool for encrypting data and creating digital signatures, compliant with the proposed OpenPGP Internet standard and the S/MIME standard.

It was found that GnuPG was vulnerable to the Yarom/Falkner flush+reload cache side-channel attack on the RSA secret exponent. An attacker able to execute a process on the logical CPU that shared the L3 cache with the GnuPG process (such as a different local user or a user of a KVM guest running on the same host with the kernel same-page merging functionality enabled) could possibly use this flaw to obtain portions of the RSA secret key. (CVE-2013-4242)

A denial of service flaw was found in the way GnuPG parsed certain compressed OpenPGP packets. An attacker could use this flaw to send specially crafted input data to GnuPG, making GnuPG enter an infinite loop when parsing data. (CVE-2013-4402)

It was found that importing a corrupted public key into a GnuPG keyring database corrupted that keyring. An attacker could use this flaw to trick a local user into importing a specially crafted public key into their keyring database, causing the keyring to be corrupted and preventing its further use. (CVE-2012-6085)

It was found that GnuPG did not properly interpret the key flags in a PGP key packet. GPG could accept a key for uses not indicated by its holder. (CVE-2013-4351)

Red Hat would like to thank Werner Koch for reporting the CVE-2013-4402 issue. Upstream acknowledges Taylor R Campbell as the original reporter.

All gnupg users are advised to upgrade to this updated package, which contains backported patches to correct these issues.

An updated libgcrypt package that fixes one security issue is now available for Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The libgcrypt library provides general-purpose implementations of various cryptographic algorithms.

It was found that GnuPG was vulnerable to the Yarom/Falkner flush+reload cache side-channel attack on the RSA secret exponent. An attacker able to execute a process on the logical CPU that shared the L3 cache with the GnuPG process (such as a different local user or a user of a KVM guest running on the same host with the kernel same-page merging functionality enabled) could possibly use this flaw to obtain portions of the RSA secret key. (CVE-2013-4242)

All libgcrypt users are advised to upgrade to this updated package, which contains a backported patch to correct this issue.

It was found that GnuPG was vulnerable to the Yarom/Falkner flush+reload cache side-channel attack on the RSA secret exponent. An attacker able to execute a process on the logical CPU that shared the L3 cache with the GnuPG process (such as a different local user or a user of a KVM guest running on the same host with the kernel same-page merging functionality enabled) could possibly use this flaw to obtain portions of the RSA secret key. (CVE-2013-4242)

It was found that GnuPG was vulnerable to the Yarom/Falkner flush+reload cache side-channel attack on the RSA secret exponent. An attacker able to execute a process on the logical CPU that shared the L3 cache with the GnuPG process (such as a different local user or a user of a KVM guest running on the same host with the kernel same-page merging functionality enabled) could possibly use this flaw to obtain portions of the RSA secret key. (CVE-2013-4242)

A denial of service flaw was found in the way GnuPG parsed certain compressed OpenPGP packets. An attacker could use this flaw to send specially crafted input data to GnuPG, making GnuPG enter an infinite loop when parsing data. (CVE-2013-4402)

It was found that importing a corrupted public key into a GnuPG keyring database corrupted that keyring. An attacker could use this flaw to trick a local user into importing a specially crafted public key into their keyring database, causing the keyring to be corrupted and preventing its further use. (CVE-2012-6085)

It was found that GnuPG did not properly interpret the key flags in a PGP key packet. GPG could accept a key for uses not indicated by its holder. (CVE-2013-4351)

The remote Oracle Linux 5 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2013-1458 advisory.

    - fix CVE-2013-4351 gpg treats no-usage-permitted keys as all-usages-permitted
    - fix CVE-2012-6085 GnuPG: read_block() corrupt key input validation
    - fix CVE-2013-4242 GnuPG susceptible to Yarom/Falkner side-channel attack
    - fix CVE-2013-4402 GnuPG: infinite recursion in the compressed packet parser

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

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

The remote Oracle Linux 5 / 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2013-1457 advisory.

    - fix CVE-2013-4242 GnuPG/libgcrypt susceptible to cache side-channel attack

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

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

Werner Koch of the GNU project reports :

Noteworthy changes in version 1.5.3 :

Mitigate the Yarom/Falkner flush+reload side-channel attack on RSA secret keys...

Note that Libgcrypt is used by GnuPG 2.x and thus this release fixes the above problem. The fix for GnuPG less than 2.0 can be found in the just released GnuPG 1.4.14.

This update of libgcrypt mitigates the Yarom/Falkner flush+reload side-channel attack on RSA secret keys. (CVE-2013-4242)

Fix for CVE-2013-4242

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

New gnupg and libgcrypt packages are available for Slackware 12.1, 12.2, 13.0, 13.1, 13.37, 14.0, and -current to fix a security issue.
New libgpg-error packages are also available for Slackware 13.1 and older as the supplied version wasn't new enough to compile the fixed version of libgcrypt.

A vulnerability has been discovered and corrected in gnupg and in libgcrypt :

Yarom and Falkner discovered that RSA secret keys in applications using GnuPG 1.x, and using the libgcrypt library, could be leaked via a side channel attack, where a malicious local user could obtain private key information from another user on the system (CVE-2013-4242).

The updated packages have been patched to correct this issue.

Minor update from upstream fixing a moderate impact security issue.

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

Yuval Yarom and Katrina Falkner discovered a timing-based information leak, known as Flush+Reload, that could be used to trace execution in programs. GnuPG and Libgcrypt followed different execution paths based on key-related data, which could be used to expose the contents of private keys.

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

Yarom and Falkner discovered that RSA secret keys in applications using the libgcrypt11 library, for example GnuPG 2.x, could be leaked via a side channel attack, where a malicious local user could obtain private key information from another user on the system.

Yarom and Falkner discovered that RSA secret keys could be leaked via a side channel attack, where a malicious local user could obtain private key information from another user on the system.

This update fixes this issue for the 1.4 series of GnuPG. GnuPG 2.x is affected through its use of the libgcrypt11 library, a fix for which will be published in DSA 2731.

ID	Name	Product	Family	Severity
91744	OracleVM 3.2 : libgcrypt (OVMSA-2016-0062)	Nessus	OracleVM Local Security Checks	low
88874	F5 Networks BIG-IP : GnuPG vulnerability (K75253136)	Nessus	F5 Networks Local Security Checks	low
80671	Oracle Solaris Third-Party Patch Update : libgcrypt (cve_2013_4242_information_disclosure)	Nessus	Solaris Local Security Checks	low
72638	GLSA-201402-24 : GnuPG, Libgcrypt: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
70634	CentOS 5 : gnupg (CESA-2013:1458)	Nessus	CentOS Local Security Checks	medium
70633	CentOS 5 / 6 : libgcrypt (CESA-2013:1457)	Nessus	CentOS Local Security Checks	low
70605	Scientific Linux Security Update : libgcrypt on SL5.x, SL6.x i386/x86_64 (20131024)	Nessus	Scientific Linux Local Security Checks	low
70604	Scientific Linux Security Update : gnupg on SL5.x i386/x86_64 (20131024)	Nessus	Scientific Linux Local Security Checks	medium
70601	RHEL 5 : gnupg (RHSA-2013:1458)	Nessus	Red Hat Local Security Checks	medium
70600	RHEL 5 / 6 : libgcrypt (RHSA-2013:1457)	Nessus	Red Hat Local Security Checks	low
70597	Oracle Linux 5 : gnupg (ELSA-2013-1458)	Nessus	Oracle Linux Local Security Checks	critical
70596	Oracle Linux 5 / 6 : libgcrypt (ELSA-2013-1457)	Nessus	Oracle Linux Local Security Checks	critical
70230	Amazon Linux AMI : libgcrypt (ALAS-2013-226)	Nessus	Amazon Linux Local Security Checks	low
70229	Amazon Linux AMI : gnupg (ALAS-2013-225)	Nessus	Amazon Linux Local Security Checks	low
69396	FreeBSD : GnuPG and Libgcrypt -- side-channel attack vulnerability (689c2bf7-0701-11e3-9a25-002590860428)	Nessus	FreeBSD Local Security Checks	low
69374	SuSE 11.2 / 11.3 Security Update : libgcrypt (SAT Patch Numbers 8201 / 8202)	Nessus	SuSE Local Security Checks	low
69356	Fedora 18 : gnupg-1.4.14-1.fc18 (2013-13940)	Nessus	Fedora Local Security Checks	low
69289	Fedora 19 : gnupg-1.4.14-1.fc19 (2013-13975)	Nessus	Fedora Local Security Checks	low
69196	Slackware 12.1 / 12.2 / 13.0 / 13.1 / 13.37 / 14.0 / current : gnupg / libgcrypt (SSA:2013-215-01)	Nessus	Slackware Local Security Checks	low
69190	Mandriva Linux Security Advisory : gnupg (MDVSA-2013:205)	Nessus	Mandriva Local Security Checks	low
69187	Fedora 19 : libgcrypt-1.5.3-1.fc19 (2013-13678)	Nessus	Fedora Local Security Checks	low
69186	Fedora 18 : libgcrypt-1.5.3-1.fc18 (2013-13671)	Nessus	Fedora Local Security Checks	low
69175	Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.04 : gnupg, libgcrypt11 vulnerability (USN-1923-1)	Nessus	Ubuntu Local Security Checks	low
69109	Debian DSA-2731-1 : libgcrypt11 - information leak	Nessus	Debian Local Security Checks	low
69108	Debian DSA-2730-1 : gnupg - information leak	Nessus	Debian Local Security Checks	low

Detections

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CVE-2013-4242

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