Horizon Alert
Summary of the vulnerability and why it matters
A flaw in hashcat's rule processing can lead to crashes or code execution. This issue arises when converting password bytes to hexadecimal, causing a buffer overflow if password candidates are 128 characters or longer.
- Can crash the application.
- May allow code execution.
- Affects password cracking tools.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this flaw by crafting a malicious rule file or using specific command-line options with very long password candidates. This could lead to a denial-of-service condition or potentially allow arbitrary code execution on the victim's machine when the vulnerable hashcat version processes the crafted input.
- Requires local execution.
- Targets hashcat's rule processing.
- Uses long password candidates.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in hashcat is unlikely to be weaponized by external attackers. Hashcat is a local password cracking tool, meaning exploitation requires direct local access or the processing of malicious files by a user. There's no network-facing component that would enable remote exploitation.
- Primarily a local exploitation vector.
- Requires user interaction or file processing.
- No observed public exploit.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize identifying and isolating any hashcat instances that process external or untrusted rule files or password candidates exceeding 128 characters. Given the critical severity and potential for arbitrary code execution, immediate containment is crucial if such usage is detected.
- Block or restrict execution of hashcat.
- Monitor for hashcat processes with long password candidates.
- Update hashcat to a version addressing the buffer overflow.
