GnuPG susceptible to Yarom/Falkner flush+reload cache side-channel attack
Published Aug 19, 2013
1.9
LOWCVSS 2.0
EPSS 0.53%
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
No data.
Configuration 1
- 10.04
- 12.04
- 12.10
- 13.04
Configuration 2
- 6.0
- 7.0
Configuration 3
- ≤ 1.4.13
- 0.0.0
- 0.2.15
- 0.2.16
- 0.2.17
- 0.2.18
- 0.2.19
- 0.3.0
- 0.3.1
- 0.3.2
- 0.3.3
- 0.3.4
- 0.3.5
- 0.4.0
- 0.4.1
- 0.4.3
- 0.4.4
- 0.4.5
- 0.9.0
- 0.9.1
- 0.9.2
- 0.9.3
- 0.9.4
- 0.9.5
- 0.9.6
- 0.9.7
- 0.9.8
- 0.9.9
- 0.9.10
- 0.9.11
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.0.4
- 1.0.4
- 1.0.5
- 1.0.5
- 1.0.6
- 1.0.7
- 1.2.0
- 1.2.1
- 1.2.1
- 1.2.2
- 1.2.3
- 1.2.4
- 1.2.5
- 1.2.6
- 1.2.7
- 1.3.0
- 1.3.1
- 1.3.2
- 1.3.3
- 1.3.4
- 1.3.6
- 1.3.90
- 1.3.91
- 1.3.92
- 1.3.93
- 1.4.0
- 1.4.10
- 1.4.11
- 1.4.12
Configuration 4
- 2.0.1
- 2.0.3
- 2.0.4
- 2.0.5
- 2.0.6
- 2.0.7
- 2.0.8
- 2.0.10
- 2.0.11
- 2.0.12
- 2.0.13
- 2.0.14
- 2.0.15
- 2.0.16
- 2.0.17
- 2.0.18
- 2.0.19
Configuration 5
No data.
Red Hat Enterprise Linux 5
gnupg-0:1.4.5-18.el5_10
Fixed · RHSA-2013:1458
Red Hat Enterprise Linux 5
libgcrypt-0:1.4.4-7.el5_10
Fixed · RHSA-2013:1457
Red Hat Enterprise Linux 6
libgcrypt-0:1.4.5-11.el6_4
Fixed · RHSA-2013:1457
Red Hat Enterprise Linux 7
libgcrypt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | gnupg-0:1.4.5-18.el5_10 | Fixed | RHSA-2013:1458 |
| Red Hat Enterprise Linux 5 | libgcrypt-0:1.4.4-7.el5_10 | Fixed | RHSA-2013:1457 |
| Red Hat Enterprise Linux 6 | libgcrypt-0:1.4.5-11.el6_4 | Fixed | RHSA-2013:1457 |
| Red Hat Enterprise Linux 7 | libgcrypt | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the version of gnupg as shipped with Red Hat Enterprise Linux 5. This issue affects the version of libgcrypt as shipped with Red Hat Enterprise Linux 5 and 6. The Red Hat Security Response Team has rated this issue as having moderate security impact, a future update may address this flaw. More technical details on this flaw are available at https://bugzilla.redhat.com/show_bug.cgi?id=988589#c12
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:L/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.53% (0.00533) | 43.00th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.53% (0.00533) | 40.55th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00069) | 18.66th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00043) | 5.22th | v3 (v2023.03.01) |
| Jan 12, 2024 | 0.04% (0.00043) | 5.93th | v3 (v2023.03.01) |
| Nov 23, 2023 | 0.05% (0.00052) | 18.10th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00043) | 5.88th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.55% (0.01547) | 74.98th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.55% (0.01547) | 74.94th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.55% (0.01547) | 72.92th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.55% (0.01547) | 51.82th | v2 (v2022.01.01) |
References (20)
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717880 x_refsource_MISC
- http://eprint.iacr.org/2013/448 x_refsource_MISC
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705 x_refsource_CONFIRM
- http://lists.gnupg.org/pipermail/gnupg-announce/2013q3/000330.html mailing-listx_refsource_MLIST
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00003.html vendor-advisoryx_refsource_SUSEVendor Advisory
- http://rhn.redhat.com/errata/RHSA-2013-1457.html vendor-advisoryx_refsource_REDHAT
- http://secunia.com/advisories/54318 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/54321 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/54332 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/54375 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://www.debian.org/security/2013/dsa-2730 vendor-advisoryx_refsource_DEBIAN
- http://www.debian.org/security/2013/dsa-2731 vendor-advisoryx_refsource_DEBIAN
- http://www.kb.cert.org/vuls/id/976534 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/61464 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-1923-1 vendor-advisoryx_refsource_UBUNTUVendor Advisory
- https://access.redhat.com/security/cve/CVE-2013-4242 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=988589 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2013-4242
- https://www.cve.org/CVERecord?id=CVE-2013-4242
Change history (0)
No recorded changes yet.