CVE-2019-18634
Published: 31 January 2020
In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.
Notes
| Author | Note |
|---|---|
| mdeslaur | pwfeedback is not enabled in Ubuntu affects 1.7.1 to 1.8.25p1 as it can't be exploited in 1.8.26 to 1.8.30 |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
sudo Launchpad, Ubuntu, Debian |
bionic |
Released
(1.8.21p2-3ubuntu1.2)
|
| eoan |
Released
(1.8.27-1ubuntu4.1)
|
|
| trusty |
Released
(1.8.9p5-1ubuntu1.5+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Released
(1.8.31)
|
|
| xenial |
Released
(1.8.16-0ubuntu1.9)
|
|
|
Patches: upstream: https://github.com/sudo-project/sudo/commit/fa8ffeb17523494f0e8bb49a25e53635f4509078 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |