CVE-2021-20263
Published: 9 March 2021
A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.
Notes
Author | Note |
---|---|
mdeslaur | introduced in 5.2.0 |
Priority
Status
Package | Release | Status |
---|---|---|
qemu Launchpad, Ubuntu, Debian |
jammy |
Not vulnerable
(1:5.2+dfsg-9ubuntu3)
|
impish |
Not vulnerable
(1:5.2+dfsg-9ubuntu3)
|
|
bionic |
Not vulnerable
(code not present)
|
|
focal |
Not vulnerable
(code not present)
|
|
groovy |
Not vulnerable
(code not present)
|
|
upstream |
Needs triage
|
|
hirsute |
Not vulnerable
(1:5.2+dfsg-9ubuntu3)
|
|
trusty |
Not vulnerable
(code not present)
|
|
xenial |
Not vulnerable
(code not present)
|
|
Patches: upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=e586edcb410543768ef009eaa22a2d9dd4a53846 |
||
qemu-kvm Launchpad, Ubuntu, Debian |
jammy |
Does not exist
|
impish |
Does not exist
|
|
bionic |
Does not exist
|
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
hirsute |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 3.3 |
Attack vector | Local |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | Low |
Availability impact | None |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |