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.

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.

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 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

The remote MiracleLinux 4 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2014-002:01 advisory.

    Libgcrypt is a general purpose crypto library based on the code used in GNU Privacy Guard. This is a     development version.
    Security issues fixed with this release:
    CVE-2013-4242     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.

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

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

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.

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

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.

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.

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.

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
70634	CentOS 5 : gnupg (CESA-2013:1458)	Nessus	CentOS Local Security Checks	2013/10/27	2021/1/4	medium
72638	GLSA-201402-24 : GnuPG, Libgcrypt: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2014/2/23	2021/1/6	medium
80671	Oracle Solaris Third-Party Patch Update : libgcrypt (cve_2013_4242_information_disclosure)	Nessus	Solaris Local Security Checks	2015/1/19	2021/1/14	low
91744	OracleVM 3.2 : libgcrypt (OVMSA-2016-0062)	Nessus	OracleVM Local Security Checks	2016/6/22	2021/1/4	low
289631	MiracleLinux 4 : libgcrypt-1.4.5-11.AXS4 (AXSA:2014-002:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	critical
69356	Fedora 18 : gnupg-1.4.14-1.fc18 (2013-13940)	Nessus	Fedora Local Security Checks	2013/8/15	2021/1/11	low
69374	SuSE 11.2 / 11.3 Security Update : libgcrypt (SAT Patch Numbers 8201 / 8202)	Nessus	SuSE Local Security Checks	2013/8/16	2021/1/19	low
70596	Oracle Linux 5 / 6 : libgcrypt (ELSA-2013-1457)	Nessus	Oracle Linux Local Security Checks	2013/10/25	2024/10/22	critical
70597	Oracle Linux 5 : gnupg (ELSA-2013-1458)	Nessus	Oracle Linux Local Security Checks	2013/10/25	2024/10/22	critical
69175	Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.04 : gnupg, libgcrypt11 vulnerability (USN-1923-1)	Nessus	Ubuntu Local Security Checks	2013/8/1	2019/9/19	low
69190	Mandriva Linux Security Advisory : gnupg (MDVSA-2013:205)	Nessus	Mandriva Local Security Checks	2013/8/2	2021/1/6	low
69289	Fedora 19 : gnupg-1.4.14-1.fc19 (2013-13975)	Nessus	Fedora Local Security Checks	2013/8/10	2021/1/11	low

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