CVE-2005-3153 in myBloggie
Summary
by MITRE
login.php in myBloggie 2.1.3 beta and earlier allows remote attackers to bypass a whitelist regular expression and conduct SQL injection attacks via a username parameter with SQL after a null character, which causes the whitelist check to succeed but injects the SQL into a query string, a different vulnerability than CVE-2005-2838. NOTE: it is possible that this is actually a bug in PHP code, in which case this should not be treated as a myBloggie vulnerability.
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Analysis
by VulDB Data Team • 07/12/2018
The vulnerability described in CVE-2005-3153 represents a sophisticated SQL injection flaw within the login.php component of myBloggie version 2.1.3 beta and earlier. This issue stems from improper input validation mechanisms that fail to adequately sanitize user-supplied data before processing. The vulnerability specifically targets the username parameter handling within the authentication flow, creating a pathway for remote attackers to manipulate database queries through carefully crafted input sequences. The flaw manifests when attackers append SQL commands following a null character within the username field, exploiting a weakness in the whitelist validation process.
The technical implementation of this vulnerability exploits a fundamental flaw in input sanitization and validation logic. The system employs a whitelist regular expression to validate username inputs, but this validation mechanism can be bypassed when a null character is inserted within the username parameter. This null character effectively terminates the string evaluation process within the validation routine, allowing the malicious SQL payload to pass the whitelist check while simultaneously injecting harmful SQL commands into the subsequent query string. This creates a scenario where the validation logic appears to succeed, but the underlying database interaction becomes compromised. The vulnerability operates at the intersection of input validation bypass and SQL injection, making it particularly insidious as it circumvents standard security controls designed to prevent such attacks.
From an operational impact perspective, this vulnerability enables remote attackers to execute arbitrary SQL commands against the affected database, potentially leading to complete system compromise. Attackers could extract sensitive information, modify database content, create new user accounts, or even escalate privileges within the application. The vulnerability's classification as a different issue from CVE-2005-2838 indicates that it represents a distinct attack vector rather than a variant of previously identified problems. The attack requires no authentication to the system itself, making it particularly dangerous as it can be exploited against the authentication mechanism directly. This vulnerability demonstrates a critical flaw in the application's security architecture where input validation and sanitization are insufficient to prevent malicious code injection.
The security implications of CVE-2005-3153 align with CWE-89, which specifically addresses SQL injection vulnerabilities, and can be mapped to ATT&CK technique T1190 for exploitation of vulnerabilities in authentication mechanisms. The vulnerability's exploitation pattern follows standard attack methodologies where attackers leverage input validation bypasses to inject malicious payloads into database queries. Organizations using affected versions of myBloggie should consider this vulnerability as a critical threat requiring immediate attention, as it fundamentally undermines the security of the authentication system. The potential for data breaches, system compromise, and unauthorized access makes this vulnerability particularly severe in environments where sensitive information is stored or processed.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and sanitization mechanisms that properly handle special characters including null bytes. The recommended approach includes implementing proper parameterized queries to prevent SQL injection regardless of input validation failures, enhancing the whitelist validation logic to properly handle null characters, and implementing comprehensive input filtering that removes or encodes potentially harmful characters before they reach database processing layers. Additionally, the application should be updated to a newer version of myBloggie that addresses this specific vulnerability, as the original affected versions contain fundamental design flaws in their input handling mechanisms. Organizations should also consider implementing web application firewalls and additional monitoring to detect and prevent exploitation attempts targeting this specific vulnerability pattern.