Local Privilege Escalation in Sudo by Affected Users
CVE-2019-18684

7HIGH

Key Information:

Vendor

Sudo Project

Status
Sudo
Vendor
CVE Published:
4 November 2019

What is CVE-2019-18684?

A vulnerability in Sudo versions up to 1.8.29 enables local users with write access to file descriptor 3 to escalate their privileges to root. This occurs due to a race condition during the execution of uid determination and the setresuid and openat system calls. An attacker can exploit this vulnerability by writing specific configurations to /proc/#####/fd/3 while Sudo is waiting for a password prompt. While there is debate regarding the practical attack vectors given Linux /proc permissions, the potential for privilege escalation poses significant risks in environments where users have the necessary access.

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References

https://gist.github.com/oxagast/51171aa161074188a11d96cbe...
x_refsource_MISC

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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