Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability has been identified in curl, a widely used tool for transferring data via various protocols. This issue could potentially allow a malicious server to trick curl into sending sensitive authentication information, like Kerberos tickets, to an untrusted host. While the direct impact depends on how curl is used within our environment, the ability to misuse authentication credentials warrants attention.
- Curl may send authentication details to wrong servers.
- Consider if curl is used with sensitive data.
- Confirm relevance and assess exposure to this risk.
Attack Path
How an attacker could exploit the issue
An attacker can trick a system running curl into sending sensitive authentication information, like Kerberos tickets, to a malicious server. This happens when curl processes an HTTP redirect that includes user credentials. The malicious server receives a valid Kerberos ticket that can be used to impersonate the user, potentially leading to unauthorized access to other network resources.
- No user interaction needed.
- Malicious server triggers redirect.
- Exposes authentication credentials.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow a malicious server to trick curl into sending a Kerberos ticket, intended for the original host, to an untrusted third-party server. This occurs when curl processes an HTTP redirect that includes user information, potentially exposing authentication credentials.
- Kerberos tickets could be exposed.
- Malicious redirects can trigger exposure.
- Unauthorized access to services may occur.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability resides within the `curl` utility, commonly employed by applications and scripts for outbound network requests. Real-world ownership will likely fall to teams responsible for the applications or scripts that utilize `curl`, potentially including application owners, platform teams, or development teams. The initial practical step involves identifying where `curl` is used, assessing the business criticality and reachability of those instances, and confirming the accountable owner for remediation planning.
- Identify applications and scripts using `curl`.
- Verify `curl` usage and business criticality.
- Confirm ownership and plan remediation actions.
