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
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Fixes

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-08-05T02:02:38.290Z

Reserved: 2019-11-04T00:00:00

Link: CVE-2019-18684

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2019-11-04T16:15:11.437

Modified: 2024-11-21T04:33:31.627

Link: CVE-2019-18684

cve-icon Redhat

Severity : Moderate

Publid Date: 2019-11-07T00:00:00Z

Links: CVE-2019-18684 - Bugzilla

cve-icon OpenCVE Enrichment

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Weaknesses