Vulnerability Description
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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sudo Project | Sudo | <= 1.8.29 |
Related Weaknesses (CWE)
References
- https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbdExploitThird Party Advisory
- https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbdExploitThird Party Advisory
FAQ
What is CVE-2019-18684?
CVE-2019-18684 is a vulnerability with a CVSS score of 7.0 (HIGH). 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 th...
How severe is CVE-2019-18684?
CVE-2019-18684 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-18684?
Check the references section above for vendor advisories and patch information. Affected products include: Sudo Project Sudo.