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Linux Malformed Auth Entry

The following analytic detects when su runs from a page-cache-corrupted binary. When this happens a partial corruption of its runtime state can prevent it from resolving the identity of the calling user. Under normal…

Description

The following analytic detects when su runs from a page-cache-corrupted binary. When this happens a partial corruption of its runtime state can prevent it from resolving the identity of the calling user. Under normal conditions, su logs both the target account and the invoking user. When exploitation has occurred via this path, the invoking username field is absent. This activity is significant because it indicates a possible privilege escalation attempt, allowing a user to gain root access. If confirmed malicious, an attacker could achieve full control over the system, execute arbitrary commands, and compromise the entire environment.

Detection logic

Detection requirements

Platform
ContainersLinuxmacOSWindows

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

Log source category
linux_secure

Known benign triggers

  • No false positives have been identified at this time.

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