CVE-2021-3286 in Spotweb
Summary
by MITRE • 01/26/2021
SQL injection exists in Spotweb 1.4.9 because the notAllowedCommands protection mechanism is inadequate, e.g., a variation of the payload may be used. NOTE: this issue exists because of an incomplete fix for CVE-2020-35545.
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Analysis
by VulDB Data Team • 02/20/2021
The vulnerability identified as CVE-2021-3286 represents a critical SQL injection flaw within Spotweb version 1.4.9, demonstrating the persistent nature of inadequate security protections in web applications. This vulnerability stems from an insufficient implementation of the notAllowedCommands protection mechanism, which was originally designed to prevent malicious SQL commands from being executed within the application's database layer. The flaw allows attackers to bypass existing safeguards through variations of attack payloads that were not properly accounted for in the initial security measures.
Spotweb is a web-based newsreader application that interacts with databases to store and retrieve news articles and related information. The SQL injection vulnerability occurs when user-supplied input is not properly sanitized before being incorporated into database queries. The inadequate protection mechanism fails to detect and block modified versions of known malicious payloads, creating an exploitable gap in the application's security architecture. This weakness directly violates the principles outlined in CWE-89, which describes SQL injection vulnerabilities as conditions where untrusted data is incorporated into SQL commands without proper sanitization or parameterization.
The operational impact of this vulnerability is severe as it allows authenticated and unauthenticated attackers to execute arbitrary SQL commands against the underlying database. Attackers can leverage this flaw to extract sensitive information, modify database contents, or potentially gain complete control over the database server. The vulnerability's persistence is particularly concerning given that it represents an incomplete fix for CVE-2020-35545, indicating that security patches may not have been thoroughly tested or that the remediation approach was fundamentally flawed. This pattern of incomplete fixes is consistent with ATT&CK technique T1078 which describes the use of valid accounts to gain access to systems and data.
The technical exploitation of this vulnerability requires understanding how the notAllowedCommands mechanism operates and identifying specific variations that can bypass the protection checks. Attackers typically employ techniques such as encoding, obfuscation, and alternative SQL syntax to circumvent simple pattern matching approaches. The vulnerability demonstrates a classic example of insufficient input validation and output encoding, where the application fails to properly distinguish between legitimate user input and malicious commands. Security researchers have noted that such flaws often arise from over-reliance on blacklisting approaches rather than implementing proper whitelisting or parameterized query mechanisms.
Organizations using Spotweb 1.4.9 should immediately implement mitigations including upgrading to a patched version that properly addresses the SQL injection vulnerability. The recommended approach involves implementing comprehensive input validation, utilizing parameterized queries, and deploying proper database access controls. Additionally, network segmentation and intrusion detection systems should be configured to monitor for suspicious database access patterns. The vulnerability highlights the importance of thorough security testing and validation of patches, as well as the necessity of implementing defense-in-depth strategies that do not rely solely on perimeter-based protections. Regular security assessments and code reviews should be conducted to identify similar patterns of inadequate protection mechanisms that could lead to similar vulnerabilities in other applications.