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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/tlsfuzzer/tlsfuzzer/pull/679 Issue Tracking, Patch
- https://gitlab.com/gnutls/gnutls/-/issues/1050 Exploit, Issue Tracking, Vendor Advisory
- https://github.com/tlsfuzzer/tlsfuzzer/pull/679 Issue Tracking, Patch
- https://gitlab.com/gnutls/gnutls/-/issues/1050 Exploit, Issue Tracking, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.4 · gnu, redhat, debianNVD modified 2026-10-14 20:17
Affected (CPE criteria) 10
cpe:2.3:a:gnu:gnutls:3.6.8-11.el8_2:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*cpe:2.3:a:netapp:converged_systems_advisor_agent:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
References 20
- https://access.redhat.com/security/cve/CVE-2023-0361 Third Party Advisory
- https://github.com/tlsfuzzer/tlsfuzzer/pull/679 Issue Tracking, Patch
- https://gitlab.com/gnutls/gnutls/-/issues/1050 Exploit, Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/02/msg00015.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UFIA3X4IZ3CW7SRQ2UHNHNPMRIAWF2FI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS4KVDOG6QTALWHC2QE4Y7VPDRMLTRWQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z634YBXAJ5VLDI62IOPBVP5K6YFHAWCY/
- https://security.netapp.com/advisory/ntap-20230324-0005/ Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230725-0005/
- https://access.redhat.com/security/cve/CVE-2023-0361 Third Party Advisory
- https://github.com/tlsfuzzer/tlsfuzzer/pull/679 Issue Tracking, Patch
- https://gitlab.com/gnutls/gnutls/-/issues/1050 Exploit, Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/02/msg00015.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UFIA3X4IZ3CW7SRQ2UHNHNPMRIAWF2FI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS4KVDOG6QTALWHC2QE4Y7VPDRMLTRWQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z634YBXAJ5VLDI62IOPBVP5K6YFHAWCY/
- https://security.netapp.com/advisory/ntap-20230324-0005/ Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230725-0005/
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-806742.html