CVE-2018-17420 in ZrLog
Summary
by MITRE
An issue was discovered in ZrLog 2.0.3. There is a SQL injection vulnerability in the article management search box via the keywords parameter.
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Analysis
by VulDB Data Team • 07/29/2023
The vulnerability identified as CVE-2018-17420 represents a critical SQL injection flaw within ZrLog version 2.0.3, specifically affecting the article management search functionality. This vulnerability resides in the handling of user input through the keywords parameter, which is processed without adequate sanitization or validation mechanisms. The affected application interface allows users to search through articles using a text-based search box, where the keywords parameter directly influences the backend database query construction. This design flaw creates an avenue for malicious actors to inject arbitrary SQL code, potentially compromising the entire database infrastructure.
The technical implementation of this vulnerability stems from improper input validation and query construction practices within the ZrLog application framework. When users enter search terms into the article management interface, the application fails to properly escape or parameterize the keywords input before incorporating it into SQL queries. This primitive approach to database interaction violates fundamental security principles and creates a direct path for attackers to manipulate database operations. The vulnerability manifests as a classic SQL injection vector where attacker-controlled input can alter the intended query structure, potentially leading to unauthorized data access, modification, or deletion. According to CWE classification, this represents a CWE-89: Improper Neutralization of Special Elements used in an SQL Command, which is categorized as a high-risk vulnerability in the CWE top 25 most dangerous software weaknesses.
The operational impact of CVE-2018-17420 extends beyond simple data exposure, as successful exploitation could enable attackers to gain unauthorized access to sensitive information stored within the ZrLog database. Attackers could potentially extract user credentials, article content, configuration data, and other confidential information that may be stored in the affected database. The vulnerability's accessibility through the public article management interface makes it particularly dangerous, as it requires no special privileges or authentication to exploit. This scenario aligns with ATT&CK technique T1071.005 for Application Layer Protocol: Web Protocols, as the attack leverages web application interfaces to execute malicious SQL commands. The potential for privilege escalation exists if the database user account has elevated permissions, potentially allowing attackers to execute administrative commands or access additional system resources beyond the database layer.
Mitigation strategies for this vulnerability should prioritize immediate patching of the ZrLog application to version 2.0.4 or later, which contains the necessary fixes for the SQL injection flaw. Organizations should implement proper input validation and parameterized query construction throughout the application codebase to prevent similar issues from emerging in other components. Database access controls should be reviewed and restricted to minimize potential damage from successful exploitation attempts. Network-level protections such as web application firewalls can provide additional defense-in-depth measures, though they should not be considered a replacement for proper code-level fixes. Security monitoring should be enhanced to detect unusual database query patterns that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of implementing secure coding practices and regular security assessments to identify and remediate such flaws before they can be exploited by malicious actors.