CVE-2021-4209
Published: 22 February 2022
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.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
gnutls26 Launchpad, Ubuntu, Debian |
focal |
Does not exist
|
| groovy |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| lunar |
Does not exist
|
|
| trusty |
Needs triage
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
| bionic |
Does not exist
|
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| eoan |
Does not exist
|
|
| jammy |
Does not exist
|
|
|
gnutls28 Launchpad, Ubuntu, Debian |
bionic |
Released
(3.5.18-1ubuntu1.6)
|
| focal |
Released
(3.6.13-2ubuntu1.7)
|
|
| impish |
Ignored
(end of life)
|
|
| kinetic |
Not vulnerable
(3.7.6-2ubuntu1)
|
|
| lunar |
Not vulnerable
(3.7.6-2ubuntu1)
|
|
| upstream |
Released
(3.7.3)
|
|
| xenial |
Released
(3.4.10-4ubuntu1.9+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| trusty |
Ignored
(end of standard support)
|
|
| jammy |
Not vulnerable
(3.7.3-4ubuntu1)
|
|
|
Patches: upstream: https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |