Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability involves a file transfer tool that, under specific redirection conditions, may expose sensitive security tokens in unencrypted network traffic. This could allow an attacker who intercepts the traffic to gain unauthorized access to cloud storage credentials.
- Sensitive security tokens may be exposed in traffic.
- Protects cloud storage access from interception.
- Confirm relevance and potential exposure.
Attack Path
How an attacker could exploit the issue
An attacker could intercept traffic if a service using rclone improperly redirects from HTTPS to HTTP. This redirection exposes sensitive AWS security tokens, allowing an attacker to potentially gain unauthorized access to cloud storage.
- Attack starts with network traffic interception.
- Triggered by an HTTPS to HTTP redirect.
- Risk of sensitive token exposure.
Live Threat
Current exploitation, exposure, and threat context
When rclone redirects from HTTPS to HTTP on the same host, it may fail to strip the `X-Amz-Security-Token` header, potentially exposing AWS STS session tokens if traffic is intercepted.
- AWS STS session tokens could be exposed.
- Plaintext HTTP traffic interception.
- Compromise of cloud storage access.
Operational Fix
Recommended remediation, mitigation, and detection steps
Determining ownership for this vulnerability requires identifying which teams manage systems that use rclone to interact with S3-compatible storage. The first step is to locate all instances of the affected rclone version, assess their exposure, and confirm which are business-critical, then engage the accountable system owner to plan remediation.
- Identify affected rclone instances and exposure.
- Confirm business criticality and accountable owner.
- Plan remediation based on identified risk.
