Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability exists in hashcat's PKZIP hash parser that could allow an attacker to disrupt services or potentially gain control of a system. This issue arises from improper handling of input data when converting hex to binary.
- Affects systems running hashcat.
- Can lead to denial of service or code execution.
- Attack requires processing a crafted file.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this flaw by tricking a user into processing a specially crafted PKZIP hash file with hashcat version 7.1.2. This crafted file would trigger a heap-based buffer overflow when the hex-to-binary function attempts to decode attacker-controlled data into a fixed-size buffer. Successful exploitation could lead to denial of service or the execution of arbitrary code.
- Requires user to run vulnerable hashcat.
- Targets PKZIP hash parsing functionality.
- Exploitation depends on specific hash modules.
Live Threat
Current exploitation, exposure, and threat context
This heap-based buffer overflow in hashcat's PKZIP parser could be weaponized for denial of service or arbitrary code execution. Attackers may find this vulnerability appealing due to its critical severity and potential for code execution, especially if exploitation proves straightforward. However, hashcat's primary use as a local password cracking tool might limit its appeal for widespread, automated attacks compared to internet-facing vulnerabilities.
- Exploitation is possible via crafted hash files.
- No public exploit or KEV signals observed.
- Vulnerability published recently.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize identifying and isolating any systems processing PKZIP hash files with hashcat version 7.1.2, as this critical vulnerability could allow unauthenticated attackers to achieve arbitrary code execution. Review logs for unusual processing of PKZIP hashes and investigate any suspicious activity.
- Block network access to affected hashcat instances.
- Update hashcat to a patched version when available.
- Monitor for signs of unauthorized code execution.
