Justin Ibarra
0e0b2ea1a4
* Update schema for threshold rule type for 7.12 * add downgrade function to drop new fields * update existing threshold rules
60 lines
1.9 KiB
TOML
60 lines
1.9 KiB
TOML
[metadata]
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creation_date = "2021/02/03"
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maturity = "production"
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updated_date = "2021/03/03"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies the attempted use of a heap-based buffer overflow vulnerability for the Sudo binary in Unix-like systems
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(CVE-2021-3156). Successful exploitation allows an unprivileged user to escalate to the root user.
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"""
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false_positives = [
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"""
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This rule could generate false positives if the process arguments leveraged by the exploit are shared by custom
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scripts using the Sudo or Sudoedit binaries. Only Sudo versions 1.8.2 through 1.8.31p2 and 1.9.0 through 1.9.5p1 are
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affected; if those versions are not present on the endpoint, this could be a false positive.
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""",
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]
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from = "now-9m"
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index = ["auditbeat-*", "logs-endpoint.events.*"]
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language = "kuery"
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license = "Elastic License v2"
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name = "Sudo Heap-Based Buffer Overflow Attempt"
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references = [
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"https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-3156",
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"https://blog.qualys.com/vulnerabilities-research/2021/01/26/cve-2021-3156-heap-based-buffer-overflow-in-sudo-baron-samedit",
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"https://www.bleepingcomputer.com/news/security/latest-macos-big-sur-also-has-sudo-root-privilege-escalation-flaw",
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"https://www.sudo.ws/alerts/unescape_overflow.html",
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]
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risk_score = 73
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rule_id = "f37f3054-d40b-49ac-aa9b-a786c74c58b8"
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severity = "high"
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tags = ["Elastic", "Host", "Linux", "macOS", "Threat Detection", "Privilege Escalation"]
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type = "threshold"
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query = '''
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event.category:process and event.type:start and
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process.name:(sudo or sudoedit) and
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process.args:(*\\ and ("-i" or "-s"))
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1068"
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name = "Exploitation for Privilege Escalation"
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reference = "https://attack.mitre.org/techniques/T1068/"
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[rule.threat.tactic]
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id = "TA0004"
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name = "Privilege Escalation"
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reference = "https://attack.mitre.org/tactics/TA0004/"
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[rule.threshold]
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field = ["host.hostname"]
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value = 100
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