CVE-2020-25648
Published: 20 October 2020
A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58.
Notes
Author | Note |
---|---|
leosilva | From SUSE and Rhel: This issue affects servers which are compiled against the NSS library. Other consumers of NSS like firefox etc are not affected by this flaw. |
eslerm | CCS handling introduced after 3.28.4 with revision c3eba3a9483abede4c35fa92b5c950a35cd9b639 and others |
Priority
Status
Package | Release | Status |
---|---|---|
nss Launchpad, Ubuntu, Debian |
bionic |
Released
(2:3.35-2ubuntu2.14)
|
focal |
Released
(2:3.49.1-1ubuntu1.7)
|
|
groovy |
Ignored
(end of life)
|
|
hirsute |
Not vulnerable
(3.61-1ubuntu2)
|
|
impish |
Not vulnerable
(3.61-1ubuntu2)
|
|
jammy |
Not vulnerable
(3.61-1ubuntu2)
|
|
kinetic |
Not vulnerable
(3.61-1ubuntu2)
|
|
trusty |
Not vulnerable
(code not present)
|
|
upstream |
Released
(2:3.61-1, 3.58)
|
|
xenial |
Not vulnerable
(code not present)
|
|
Patches: upstream: https://hg.mozilla.org/projects/nss/rev/57bbefa793232586d27cee83e74411171e128361 |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |