GHSA-m7wr-2xf7-cm9p pgx SQL Injection via Line Comment Creation

• Go github.com/jackc/pgx: < 4.18.2 → fixed in 4.18.2 • Go github.com/jackc/pgx/v4: < 4.18.2 → fixed in 4.18.2

Impact SQL injection can occur when all of the following conditions are met: 1. The non-default simple protocol is used. 2. A placeholder for a numeric value must be immediately preceded by a minus. 3. There must be a second placeholder for a string value after the first placeholder; both must be on the same line. 4. Both parameter values must be user-controlled. e.g. Simple mode must be enabled: ```go // connection string includes "prefer_simple_protocol=true" // or // directly enabled in code config.ConnConfig.PreferSimpleProtocol = true ``` Parameterized query: ```sql SELECT * FROM example WHERE result=-$1 OR name=$2; ``` Parameter values: `$1` => `-42` `$2` => `"foo\n 1 AND 1=0 UNION SELECT * FROM secrets; --"` Resulting query after preparation: ```sql SELECT * FROM example WHERE result=--42 OR name= 'foo 1 AND 1=0 UNION SELECT * FROM secrets; --'; ``` Patches The problem is resolved in v4.18.2. Workarounds Do not use the simple protocol or do not place a minus directly before a placeholder.