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
Metrics
Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: mitre
Published: 2019-11-04T15:53:31
Updated: 2024-08-05T02:02:38.290Z
Reserved: 2019-11-04T00:00:00
Link: CVE-2019-18684
Vulnrichment
No data.
NVD
Status : Modified
Published: 2019-11-04T16:15:11.437
Modified: 2024-11-21T04:33:31.627
Link: CVE-2019-18684
Redhat