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)

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.

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.

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.

The remote MiracleLinux 3 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2013-679:01 advisory.

    GnuPG (GNU Privacy Guard) is a GNU utility for encrypting data and creating digital signatures. GnuPG has     advanced key management capabilities and is compliant with the proposed OpenPGP Internet standard     described in RFC2440. Since GnuPG doesn't use any patented algorithm, it is not compatible with any     version of PGP2 (PGP2.x uses only IDEA for symmetric-key encryption, which is patented worldwide).
    Security issues fixed with this release:
     CVE-2012-6085     The read_block function in g10/import.c in GnuPG 1.4.x before 1.4.13 and 2.0.x through 2.0.19, when     importing a key, allows remote attackers to corrupt the public keyring database or cause a denial of     service (application crash) via a crafted length field of an OpenPGP packet.
     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.
     CVE-2013-4351     GnuPG 1.4.x, 2.0.x, and 2.1.x treats a key flags subpacket with all bits cleared (no usage permitted) as     if it has all bits set (all usage permitted), which might allow remote attackers to bypass intended     cryptographic protection mechanisms by leveraging the subkey.
     CVE-2013-4402     GnuPG 1.4.x before 1.4.15 and 2.0.x before 2.0.22 allows remote attackers to cause a denial of service     (infinite recursion) via a crafted OpenPGP message.

Tenable has extracted the preceding description block directly from the MiracleLinux 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 MiracleLinux 3 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2013-678:01 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.

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.

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.

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 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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
70604	Scientific Linux Security Update : gnupg on SL5.x i386/x86_64 (20131024)	Nessus	Scientific Linux Local Security Checks	2013/10/25	2021/1/14	medium
70230	Amazon Linux AMI : libgcrypt (ALAS-2013-226)	Nessus	Amazon Linux Local Security Checks	2013/10/1	2018/4/18	low
70633	CentOS 5 / 6 : libgcrypt (CESA-2013:1457)	Nessus	CentOS Local Security Checks	2013/10/27	2021/1/4	low
69109	Debian DSA-2731-1 : libgcrypt11 - information leak	Nessus	Debian Local Security Checks	2013/7/30	2021/1/11	low
288927	MiracleLinux 3 : gnupg-1.4.5-18.AXS3 (AXSA:2013-679:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	critical
291464	MiracleLinux 3 : libgcrypt-1.4.4-7.AXS3 (AXSA:2013-678:01)	Nessus	Miracle Linux Local Security Checks	2026/1/19	2026/1/19	critical
70600	RHEL 5 / 6 : libgcrypt (RHSA-2013:1457)	Nessus	Red Hat Local Security Checks	2013/10/25	2021/1/14	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
70596	Oracle Linux 5 / 6 : libgcrypt (ELSA-2013-1457)	Nessus	Oracle Linux Local Security Checks	2013/10/25	2024/10/22	critical
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
70597	Oracle Linux 5 : gnupg (ELSA-2013-1458)	Nessus	Oracle Linux Local Security Checks	2013/10/25	2024/10/22	critical

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