CVE-2013-4242

Severity: low (CVSS 1.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-08-19 · updated 2026-06-16
Weakness: CWE-200

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.

Affected products

Canonical Ubuntu Linux: 10.04, 12.04, 12.10, 13.04
Debian Linux: 6.0, 7.0
GnuPG: through 1.4.13; 0.0.0, 0.2.15, 0.2.16, 0.2.17, 0.2.18, 0.2.19 (+71)
gnupg Libgcrypt: through 1.5.2; 1.4.0, 1.4.3, 1.4.4, 1.4.5, 1.4.6, 1.5.0 (+1)
Opensuse: 12.2, 12.3

References

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717880
http://eprint.iacr.org/2013/448
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
http://lists.gnupg.org/pipermail/gnupg-announce/2013q3/000330.html
http://lists.opensuse.org/opensuse-updates/2013-08/msg00003.html
http://rhn.redhat.com/errata/RHSA-2013-1457.html
http://secunia.com/advisories/54318
http://secunia.com/advisories/54321
http://secunia.com/advisories/54332
http://secunia.com/advisories/54375
http://www.debian.org/security/2013/dsa-2730
http://www.debian.org/security/2013/dsa-2731

Get alerted when CVE-2013-4242 or the next vulnerability affects your stack