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Deprecated - Sudo Heap-Based Buffer Overflow Attempt

Identifies 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.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ContainersIaaSIdentity ProviderLinuxmacOSOffice SuiteWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source category
event_index

Known benign triggers

  • This rule could generate false positives if the process arguments leveraged by the exploit are shared by custom 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 affected; if those versions are not present on the endpoint, this could be a false positive.

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