CVE-2005-4688 in PunBB
Summary
by MITRE
PunBB 1.2.9 does not require password entry when changing the e-mail address in an account s profile, which might allow an attacker to make an address change via a hijacked login session.
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Analysis
by VulDB Data Team • 07/16/2018
The vulnerability described in CVE-2005-4688 represents a critical session management flaw in PunBB version 1.2.9, a popular open-source bulletin board system. This issue stems from insufficient authentication requirements during account profile modifications, specifically when changing email addresses. The flaw allows attackers to exploit hijacked login sessions to alter user email addresses without proper password verification, effectively bypassing the system's security controls designed to protect user account integrity.
This vulnerability operates through a fundamental weakness in the application's authentication flow where the system fails to enforce password confirmation for sensitive profile modifications. When users attempt to change their email addresses within their account profiles, the application does not require re-authentication through password entry or other secondary verification mechanisms. The absence of this security check creates an exploitable condition where an attacker who has gained access to a valid user session can manipulate account settings without proper authorization.
The operational impact of this vulnerability extends beyond simple email address modification, as it provides attackers with a potential foothold for further account compromise. By changing email addresses, attackers can redirect account recovery emails, making it easier to hijack accounts permanently. This weakness aligns with CWE-613, which addresses insufficient session validation, and represents a classic example of session management vulnerability that can lead to account takeover scenarios. The attack vector is particularly dangerous because it leverages existing valid sessions, making detection more difficult and increasing the likelihood of successful exploitation.
The security implications of this flaw can be analyzed through the lens of the MITRE ATT&CK framework, specifically under the T1566 technique for credential harvesting and T1078 for valid accounts. Attackers can exploit this vulnerability to gain unauthorized access to user accounts by simply hijacking existing sessions and modifying email addresses to point to attacker-controlled addresses. This modification can then be used to bypass account recovery mechanisms, effectively locking out legitimate users while maintaining access to compromised accounts. The vulnerability demonstrates poor defense-in-depth principles where multiple security controls should be implemented to protect against unauthorized modifications to sensitive account information.
Mitigation strategies for this vulnerability should focus on implementing mandatory authentication requirements for all profile modifications, particularly those that affect account recovery mechanisms. Organizations should enforce password confirmation or secondary authentication for email address changes, ensuring that any modification to critical account information requires explicit user verification. The fix should also include session validation checks that verify the authenticity of user intent before allowing profile modifications. Additionally, implementing account activity monitoring and alerting mechanisms can help detect suspicious email address changes and notify users of potential account compromise. This vulnerability highlights the importance of maintaining strong authentication controls for all account management functions, particularly those that can be used to circumvent security measures and establish persistent access to user accounts.