Horizon Alert
Summary of the vulnerability and why it matters
This advisory details a critical vulnerability in the CallBackery Perl module, specifically affecting versions prior to 0.62.0. The issue allows unauthenticated attackers to inject malicious log entries by manipulating login names, potentially forging administrative actions or other sensitive log data. Given its network accessibility and lack of authentication requirements, this vulnerability could be exploited by external actors to compromise log integrity.
- Log forgery is possible via login names.
- Attacker can impersonate users, including administrators.
- Confirm relevance and verify log integrity.
Attack Path
How an attacker could exploit the issue
An attacker can inject malicious log entries into the application's logs by exploiting a flaw in how login names are processed. Since the login function doesn't require any authentication, an attacker can send specially crafted login names that include newline characters. This allows them to insert fake log records, potentially impersonating an administrator from any IP address they choose.
- No authentication required to access.
- Login name injection triggers the vulnerability.
- Attacker can forge log entries.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an unauthenticated attacker to inject forged log records into the application log. This could occur when a user attempts to log in, and the login name contains newline characters. When supported by the advisory, an attacker could craft a login name that includes a newline followed by malicious log data, potentially masquerading as a successful administrator login from a specified address.
- Application logs.
- Via unauthenticated login RPC method.
- Forged log entries for administrative actions.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in CallBackery affects unauthenticated login RPC methods, allowing for log injection and the forging of log records, including administrative actions. Ownership likely resides with application or platform teams managing the Perl-based CallBackery instances. The initial step is to inventory all instances, assess their exposure and business criticality, and identify the accountable owner for remediation planning.
- Application or platform teams own the issue.
- Verify unauthenticated RPC method exposure.
- Plan remediation based on asset criticality.
