CVE-2023-3255
Published: 13 September 2023
A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.
Notes
| Author | Note |
|---|---|
Priority reason: This can only be used as a DoS by an authenticated user to the VNC service. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
qemu Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
| focal |
Not vulnerable
(code not present)
|
|
| jammy |
Released
(1:6.2+dfsg-2ubuntu6.16)
|
|
| kinetic |
Ignored
(end of life, was deferred [2023-07-14])
|
|
| lunar |
Released
(1:7.2+dfsg-5ubuntu2.4)
|
|
| mantic |
Not vulnerable
(1:8.0.4+dfsg-1ubuntu3)
|
|
| noble |
Not vulnerable
(1:8.0.4+dfsg-1ubuntu5)
|
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(code not present)
|
|
|
Patches: upstream: https://gitlab.com/qemu-project/qemu/-/commit/d921fea338c1059a27ce7b75309d7a2e485f710b |
||
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 |