OS Command Injection in User Password Settings Dialog

An OS command injection vulnerability was found in yast2-users. When displaying the "Password Settings" tab of a user, get_password_term() in src/include/users/dialogs.rb read the shadowLastChange and shadowExpire fields with GetString(), which performs no numeric validation, and passed the resulting string to format_days_after_epoch(). That helper interpolated the value into a shell command executed via Ruby backticks without quoting or escaping. Impact: an administrator who manages users against an external/federated LDAP directory via `yast2 users` triggers root command execution the moment they view or edit that particular user's "Password Settings" tab. No "join domain" or trust setup is required, just browsing/editing one user entry. This issue affects yast2-users through 5.0.8.

Casky was already ahead

This CVE exploits attack patterns that Casky's 447matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-59680 is a critical OS command injection vulnerability in yast2-users that exploits unsafe string handling in the password settings interface. The vulnerability occurs when the GetString() function retrieves shadowLastChange and shadowExpire fields from user records without numeric validation, then passes these untrusted values directly into a shell command via Ruby backticks in the format_days_after_epoch() helper. An attacker with administrative privileges could inject arbitrary shell commands by crafting malicious values in shadow file fields, gaining code execution with system privileges. This affects system administrators managing user accounts on affected systems, potentially compromising entire infrastructure through privilege escalation and lateral movement.

Casky's 447 matched skills leverage Claude's extended reasoning to map attack patterns across MITRE ATT&CK's Initial Access (TA0001), Resource Development (TA0043), and Execution (TA0002) tactics. Practitioners using Casky would identify detection signals including: command-line arguments containing shell metacharacters in user management processes, unusual spawning of child processes from yast2-users, and suspicious system calls following password settings modifications. The platform's security skills would correlate CWE-78 (OS Command Injection) and CWE-1287 (Improper Validation of Specified Type of Input) patterns, highlighting the critical control failure—lack of input sanitization before shell execution—and enabling defenders to detect exploitation attempts through process execution monitoring and system call analysis.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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447 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-59680.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043 TA0002

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