CVE-2007-3907 in LedgerSMB
Summary
by MITRE
Unspecified vulnerability in login.pl in LedgerSMB 1.2.0 through 1.2.6 allows remote attackers to bypass authentication and perform certain actions as an arbitrary user via unspecified vectors involving a URL with a redirect parameter value, along with a callback parameter containing an escaped URL that specifies the action.
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Analysis
by VulDB Data Team • 09/05/2018
The vulnerability described in CVE-2007-3907 represents a critical authentication bypass flaw within the LedgerSMB accounting software version 1.2.0 through 1.2.6. This issue manifests through improper handling of redirect and callback parameters in the login.pl script, creating a pathway for remote attackers to escalate privileges and execute unauthorized actions. The vulnerability operates by exploiting the application's trust in user-supplied URL parameters without adequate validation or sanitization.
The technical exploitation involves manipulation of URL parameters that control the application's redirect behavior and callback mechanisms. Attackers can construct malicious URLs containing redirect parameter values that point to arbitrary targets, combined with callback parameters containing escaped URLs that specify desired actions within the system. This creates a scenario where the application processes these parameters without sufficient verification, allowing unauthorized access to user accounts and system functionality. The vulnerability falls under the category of insecure direct object references and improper input validation, as outlined in CWE-284 for unauthorized access and CWE-642 for improper input validation.
The operational impact of this vulnerability is severe as it enables remote attackers to assume the identity of any user within the system, potentially gaining access to sensitive financial data, user accounts, and administrative functions. An attacker could leverage this flaw to perform financial transactions, modify user permissions, access confidential reports, and potentially escalate privileges to administrator level access. This authentication bypass capability significantly undermines the security posture of organizations relying on LedgerSMB for their accounting operations, as it allows unauthorized access without requiring valid credentials.
Organizations affected by this vulnerability should implement immediate mitigations including input validation for all redirect and callback parameters, implementation of strict parameter whitelisting, and enforcement of proper authentication checks. The application should validate that redirect URLs point to trusted domains only and sanitize all callback parameters to prevent arbitrary code execution. Security measures should align with ATT&CK technique T1078 for valid accounts and T1566 for credential access through web application vulnerabilities. Regular security updates and patches should be applied immediately upon availability, as this vulnerability represents a known issue that has been addressed in subsequent versions of the software.