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Sudo Heap-Based Buffer Overflow Attempt
editSudo Heap-Based Buffer Overflow Attempt
editIdentifies the attempted use of a heap-based buffer overflow vulnerability for the Sudo binary in Unix-like systems (CVE-2021-3156). Successful exploitation allows an unprivileged user to escalate to the root user.
Rule type: threshold
Rule indices:
- auditbeat-*
- logs-endpoint.events.*
Severity: high
Risk score: 73
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-3156
- https://blog.qualys.com/vulnerabilities-research/2021/01/26/cve-2021-3156-heap-based-buffer-overflow-in-sudo-baron-samedit
- https://www.bleepingcomputer.com/news/security/latest-macos-big-sur-also-has-sudo-root-privilege-escalation-flaw
- https://www.sudo.ws/alerts/unescape_overflow.html
Tags:
- Domain: Endpoint
- OS: Linux
- OS: macOS
- Use Case: Threat Detection
- Tactic: Privilege Escalation
- Use Case: Vulnerability
- Data Source: Elastic Defend
Version: 103
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editevent.category:process and event.type:start and
process.name:(sudo or sudoedit) and
process.args:(*\\ and ("-i" or "-s"))
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
-
Technique:
- Name: Exploitation for Privilege Escalation
- ID: T1068
- Reference URL: https://attack.mitre.org/techniques/T1068/