Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability relates to how a common data transfer tool handles saving local files, potentially widening file access permissions unintentionally during the save process. While the core issue is technical, its impact could affect systems that rely on the secure handling of these local files.
- Unintended file permission changes when saving data.
- Confirm relevance and exposure to understand impact.
- Assess local file handling for potential security gaps.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this vulnerability if they can trick a user into running a vulnerable version of curl, which then writes sensitive data like cookies, alt-svc, or HSTS information to a local file. During the file-saving process, curl might inadvertently broaden the permissions on this file. This widened access could then allow unauthorized users to read or modify the sensitive information that was intended to be private.
- User-initiated curl command execution.
- Saving cookies, alt-svc, or HSTS data.
- Unauthorized access to sensitive data.
Live Threat
Current exploitation, exposure, and threat context
When curl saves local files like cookies, alt-svc, or hsts data, a renaming operation could inadvertently widen file permissions. This means that a file intended for a specific user might become accessible to others on the same system, depending on how the operating system handles file permission changes during this process.
- Local configuration files at risk.
- Permissions widened during file rename.
- Unauthorized access to local data.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability impacts applications using specific versions of curl for file operations, potentially affecting system administrators, developers, and end-users. The initial step is to identify all systems where affected curl versions are deployed, determine if these operations are business-critical or exposed to untrusted input, and then assign ownership for remediation.
- Identify affected application and system owners.
- Verify if vulnerable curl operations are exposed.
- Plan remediation based on risk assessment.
