Description
A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption the attacker would need to send a large amount of specially crafted messages to the vulnerable server. By recovering the secret from the ClientKeyExchange message, the attacker would be able to decrypt the application data exchanged over that connection.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | gnutls | gnutls-3.7.6 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gnutls28 | 3.7.8-5 | — |
| Debian 13 | gnutls28 | 3.7.8-5 | — |
| Debian 12 | gnutls28 | 3.7.8-5 | — |
| Debian 11 | gnutls28 | 3.7.1-5+deb11u3 | DSA-5349-1 |
| Debian 10 | gnutls28 | 3.6.7-4+deb10u10 | DLA-3321-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.2 | USN-5901-1 |
| Ubuntu 20.04 LTS | gnutls28 | 3.6.13-2ubuntu1.8 | USN-5901-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | gnutls28 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | gnutls28 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | gnutls +4 | 3.7.6-18.el9_1 | RHSA-2023:1141 |
| RHEL 8 | gnutls +4 | 3.6.16-6.el8_7 | RHSA-2023:1569 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | gnutls +4 | 3.7.6-18.el9_0 | RHSA-2023:1200 |
| RHEL 8.6 EUS | gnutls +4 | 3.6.16-5.el8_6.1 | RHSA-2023:3361 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | gnutls +4 | 3.7.6-18.el9_1 | ALSA-2023:1141 |
| AlmaLinux 8 | gnutls +4 | 3.6.16-6.el8_7 | ALSA-2023:1569 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | gnutls | 3.7.6-18.el9_1 | RLSA-2023:1141 |
| Rocky Linux 8 | gnutls | 3.6.16-6.el8_7 | RLSA-2023:1569 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | gnutls | 3.7.3-150400.4.27.1 | SUSE-SU-2023:0475-1 |
| SLES 15 SP1 | gnutls | 3.6.7-150000.6.50.1 | SUSE-SU-2023:4952-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | gnutls | 3.6.7-150000.6.50.1 | SUSE-SU-2023:4952-1 |
| SLE Real Time 15 SP3 | gnutls | 3.6.7-150200.14.25.2 | SUSE-SU-2023:0610-1 |
| SLE Micro 5.3 | gnutls | 3.7.3-150400.1.3.1 | SUSE-SU-2024:1179-1 |
| SLE Micro 5.2 | gnutls | 3.6.7-150200.14.25.2 | SUSE-SU-2023:0610-1 |
| SLE Micro 5.1 | gnutls | 3.6.7-150200.14.25.2 | SUSE-SU-2023:0610-1 |
| SLE HPC 15 SP1 | gnutls | 3.6.7-150000.6.50.1 | SUSE-SU-2023:4952-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gnutls | 3.7.9-1.2 | openSUSE-SU-2024:12699-1 |
| openSUSE Leap 15.4 | gnutls | 3.7.3-150400.4.27.1 | SUSE-SU-2023:0475-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | gnutls | 3.8.0-r0 | — |
| Alpine v3.23 | gnutls | 3.8.0-r0 | — |
| Alpine v3.22 | gnutls | 3.8.0-r0 | — |
| Alpine v3.21 | gnutls | 3.8.0-r0 | — |
| Alpine v3.20 | gnutls | 3.8.0-r0 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | gnutls | 3.8.0-r0 | — |
| Alpine v3.18 | gnutls | 3.8.0-r0 | — |
| Alpine v3.17 | gnutls | 3.7.8-r3 | — |
| Alpine v3.16 | gnutls | 3.7.7-r1 | — |
| Alpine v3.15 | gnutls | 3.7.1-r2 | — |
| Alpine v3.14 | gnutls | 3.7.1-r2 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | gnutls +4 | 3.7.8-360.amzn2023.0.4 | ALAS2023-2023-171 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | gnutls | 3.7.7-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | gnutls +4 | 3.7.6-18.el9_1 | ELSA-2023-1141 |
| Oracle Linux 8 | gnutls +4 | 3.6.16-6.el8_7 | ELSA-2023-1569 |
Advisories 29
- ALSA-2023:1141 Moderate: gnutls security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:1569 Moderate: gnutls security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2023-0353 GnuTLS: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Aug 31, 2026
- RHSA-2023:1569 Red Hat Security Advisory: gnutls security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:3361 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:1200 Red Hat Security Advisory: gnutls security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:1141 Red Hat Security Advisory: gnutls security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-5901-1 gnutls28 vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5349-1 gnutls28 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3321-1 gnutls28 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:1569 Moderate: gnutls security and bug fix update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:1141 Moderate: gnutls security and bug fix update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2023:0610-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0475-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12699-1 gnutls-3.7.9-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1542 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- SUSE-SU-2023:4952-1 Security update for gnutls SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2024:1179-1 Security update for gnutls SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-1794 Oracle MySQL: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 30, 2024
- SSA-806742 SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.4 Siemens ProductCERT · Feb 13, 2024
- ICSA-24-046-11 Siemens SCALANCE XCM-/XRM-300 CISA ICS & IT advisories · Feb 13, 2024
- WID-SEC-2023-2679 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 17, 2023
- WID-SEC-2023-1812 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 20, 2023
- WID-SEC-2023-1021 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 29, 2023
- ALAS2023-2023-171 Important: gnutls security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 3, 2023
- ELSA-2023-1569 Moderate: gnutls security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 4, 2023
- ELSA-2023-1141 Moderate: gnutls security and bug fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 8, 2023
References
- https://access.redhat.com/security/cve/CVE-2023-0361
- https://github.com/tlsfuzzer/tlsfuzzer/pull/679
- https://gitlab.com/gnutls/gnutls/-/issues/1050
- [debian-lts-announce] 20230218 [SECURITY] [DLA 3321-1] gnutls28 security update mailing-list
- FEDORA-2023-1c4a6a47ae vendor-advisory
- FEDORA-2023-5b378b82b3 vendor-advisory
- FEDORA-2023-4fc4c33f2b vendor-advisory
- https://security.netapp.com/advisory/ntap-20230324-0005/
- https://security.netapp.com/advisory/ntap-20230725-0005/