CVE-2013-4242 Information disclosure in n/a

Low 1.9 Published 19 Aug 2013 Updated 6 Aug 2024

Local attackers can extract private RSA keys from GnuPG via L3 cache side-channel attacks, compromising cryptographic security.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2013-4242?

CVE-2013-4242 is a low-severity vulnerability in Canonical Ubuntu Linux, published on 19 Aug 2013. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-200

Which versions are affected by CVE-2013-4242?

It affects 5 products.

Linux distribution packages (20)

`libgcrypt` Red Hat:enterprise_linux:5::client	All versions	`0:1.4.4-7.el5_10`
`libgcrypt-debuginfo` Red Hat:enterprise_linux:5::client	All versions	`0:1.4.4-7.el5_10`
`libgcrypt` Red Hat:enterprise_linux:5::client_workstation	All versions	`0:1.4.4-7.el5_10`
`libgcrypt-debuginfo` Red Hat:enterprise_linux:5::client_workstation	All versions	`0:1.4.4-7.el5_10`
`libgcrypt-devel` Red Hat:enterprise_linux:5::client_workstation	All versions	`0:1.4.4-7.el5_10`
`libgcrypt` Red Hat:enterprise_linux:5::server	All versions	`0:1.4.4-7.el5_10`
`libgcrypt-debuginfo` Red Hat:enterprise_linux:5::server	All versions	`0:1.4.4-7.el5_10`
`libgcrypt-devel` Red Hat:enterprise_linux:5::server	All versions	`0:1.4.4-7.el5_10`
`libgcrypt` Red Hat:enterprise_linux:6::client	All versions	`0:1.4.5-11.el6_4`
`libgcrypt-debuginfo` Red Hat:enterprise_linux:6::client	All versions	`0:1.4.5-11.el6_4`
`libgcrypt-devel` Red Hat:enterprise_linux:6::client	All versions	`0:1.4.5-11.el6_4`
`libgcrypt` Red Hat:enterprise_linux:6::computenode	All versions	`0:1.4.5-11.el6_4`
`libgcrypt-debuginfo` Red Hat:enterprise_linux:6::computenode	All versions	`0:1.4.5-11.el6_4`
`libgcrypt-devel` Red Hat:enterprise_linux:6::computenode	All versions	`0:1.4.5-11.el6_4`
`libgcrypt` Red Hat:enterprise_linux:6::server	All versions	`0:1.4.5-11.el6_4`
`libgcrypt-debuginfo` Red Hat:enterprise_linux:6::server	All versions	`0:1.4.5-11.el6_4`
`libgcrypt-devel` Red Hat:enterprise_linux:6::server	All versions	`0:1.4.5-11.el6_4`
`libgcrypt` Red Hat:enterprise_linux:6::workstation	All versions	`0:1.4.5-11.el6_4`
`libgcrypt-debuginfo` Red Hat:enterprise_linux:6::workstation	All versions	`0:1.4.5-11.el6_4`
`libgcrypt-devel` Red Hat:enterprise_linux:6::workstation	All versions	`0:1.4.5-11.el6_4`

Products include Canonical Ubuntu Linux, Debian Debian Linux, Gnupg Gnupg, Gnupg Libgcrypt, Opensuse Opensuse.

How do I fix CVE-2013-4242?

Upgrade to a fixed version.

Is CVE-2013-4242 being exploited?

There is no known exploitation of CVE-2013-4242 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as DSA-2730-1, DSA-2731-1, GHSA-rpp2-q7rq-p78j, MGASA-2013-0239, RHSA-2013:1457.