CVE-2021-4209

Description

A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.

CVSS breakdown

Affected products

• gnu / gnutls3.7.3
• NetApp / active_iq_unified_manager
• NetApp / hci_bootstrap_os
• NetApp / solidfire_&_hci_management_node
• RedHat / enterprise_linux8.0 – 8.0

References

• MISChttps://gitlab.com/gnutls/gnutls/-/issues/1306
• MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2044156
• VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2021-4209
• MISChttps://gitlab.com/gnutls/gnutls/-/merge_requests/1503
• MISChttps://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
• MISChttps://security.netapp.com/advisory/ntap-20220915-0005/