CVE-2020-27840
Published: 24 March 2021
A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.
Notes
| Author | Note |
|---|---|
| mdeslaur | This issue is actually in the ldb package, the samba package uses the system ldb library, not the included one |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
ldb Launchpad, Ubuntu, Debian |
bionic |
Released
(2:1.2.3-1ubuntu0.2)
|
| focal |
Released
(2:2.0.10-0ubuntu0.20.04.3)
|
|
| groovy |
Released
(2:2.1.4-2ubuntu0.1)
|
|
| trusty |
Released
(1:1.1.24-0ubuntu0.14.04.2+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Needs triage
|
|
| xenial |
Released
(2:1.1.24-1ubuntu3.2)
|
|
|
Patches: upstream: https://bugzilla.samba.org/attachment.cgi?id=16460 (master) upstream: https://bugzilla.samba.org/attachment.cgi?id=16462 (4.13) upstream: https://bugzilla.samba.org/attachment.cgi?id=16463 (4.12) upstream: https://bugzilla.samba.org/attachment.cgi?id=16464 (4.11) |
||
|
samba Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not compiled)
|
| focal |
Not vulnerable
(code not compiled)
|
|
| groovy |
Not vulnerable
(code not compiled)
|
|
| trusty |
Not vulnerable
(code not compiled)
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(code not compiled)
|
|
|
Patches: upstream: https://bugzilla.samba.org/attachment.cgi?id=16460 (master) upstream: https://bugzilla.samba.org/attachment.cgi?id=16462 (4.13) upstream: https://bugzilla.samba.org/attachment.cgi?id=16463 (4.12) upstream: https://bugzilla.samba.org/attachment.cgi?id=16464 (4.11) |
||
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 |