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CVE-2022-29498: SQL injection for certain queries with variables · Issue #392 · ankane/blazer

Blazer before 2.6.0 allows SQL Injection. In certain circumstances, an attacker could get a user to run a query they would not have normally run.

CVE
#sql#vulnerability

Blazer queries with variables are vulnerable to SQL injection in certain cases. This vulnerability has been assigned the CVE identifier CVE-2022-29498.

Versions Affected: 2.5.0 and below
Fixed Versions: 2.6.0

Impact

For some queries, specific variable values can modify the query rather than just the variable. This can occur if:

  1. the query’s data source uses different escaping than the Rails database OR
  2. the query has a variable inside a string literal

Since Blazer is designed to run arbitrary queries, the impact will typically be low. Users cannot run any queries they could not have already run. However, an attacker could get a user to run a query they would not have normally run. If the data source has write permissions, this could include modifying data in some cases.

Mitigation

All users running an affected release should upgrade when possible.

Blazer now uses parameterized queries or prepared statements for variables for a number of data sources, which mitigates the issue for their queries. Escaping has been fixed for the other data sources, but it’s still possible for users to write queries that can’t be escaped correctly, like SELECT '{var}'. For this reason, data sources should use credentials with read-only permissions.

Credit

Thanks to Al Chou for reporting the escaping issue.

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