SQL injection in Log4cxx when using the ODBC appender to send log messages
to a database. No fields sent to the database were properly escaped for SQL
injection. This has been the case since at least version 0.9.0(released
2003-08-06) Note that Log4cxx is a C++ framework, so only C++ applications
are affected. Before version 1.1.0, the ODBC appender was automatically
part of Log4cxx if the library was found when compiling the library. As of
version 1.1.0, this must be both explicitly enabled in order to be compiled
in. Three preconditions must be met for this vulnerability to be possible:
- Log4cxx compiled with ODBC support(before version 1.1.0, this was
auto-detected at compile time) 2. ODBCAppender enabled for logging messages
to, generally done via a config file 3. User input is logged at some point.
If your application does not have user input, it is unlikely to be
affected. Users are recommended to upgrade to version 1.1.0 which properly
binds the parameters to the SQL statement, or migrate to the new DBAppender
class which supports an ODBC connection in addition to other databases.
Note that this fix does require a configuration file update, as the old
configuration files will not configure properly. An example is shown below,
and more information may be found in the Log4cxx documentation on the
ODBCAppender. Example of old configuration snippet: <appender
name=“SqlODBCAppender” class=“ODBCAppender”> <param name=“sql”
value=“INSERT INTO logs (message) VALUES (‘%m’)” /> … other params here
… </appender> The migrated configuration snippet with new ColumnMapping
parameters: <appender name=“SqlODBCAppender” class=“ODBCAppender”> <param
name=“sql” value=“INSERT INTO logs (message) VALUES (?)” /> <param
name=“ColumnMapping” value=“message”/> … other params here …
</appender>