Race Condition Affecting sudo package, versions *


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.29% (21st percentile)

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  • Snyk IDSNYK-DEBIAN8-SUDO-482060
  • published10 Nov 2019
  • disclosed4 Nov 2019

Introduced: 4 Nov 2019

CVE-2019-18684  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

There is no fixed version for Debian:8 sudo.

NVD Description

Note: Versions mentioned in the description apply only to the upstream sudo package and not the sudo package as distributed by Debian. See How to fix? for Debian:8 relevant fixed versions and status.

Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write "ALL ALL=(ALL) NOPASSWD:ALL" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers

CVSS Base Scores

version 3.1