If a user sends a request to a org.eclipse.jetty.servlets.CGI Servlet for a binary with a space in its name, the servlet
will escape the command by wrapping it in quotation marks. This wrapped command, plus
an optional command prefix, will then be executed through a call to Runtime.exec. If the
original binary name provided by the user contains a quotation mark followed by a space,
the resulting command line will contain multiple tokens instead of one. For example, if a
request references a binary called file” name “here, the escaping algorithm will
generate the command line string “file” name “here”, which will invoke the binary
named file, not the one that the user requested.

if (execCmd.length() > 0 && execCmd.charAt(0) != '"' && execCmd.contains(" "))
execCmd = "\"" + execCmd + "\"";

Exploit Scenario

The cgi-bin directory contains a binary named exec and a subdirectory named exec”
commands, which contains a file called bin1. The user sends to the CGI servlet a request
for the filename exec” commands/bin1. This request will pass the file existence check on
lines 194 through 205. The servlet will add quotation marks around this filename, resulting
in the command line string “exec” commands/bin1”. When this string is passed to
Runtime.exec, instead of executing the bin1 binary, the server will execute the exec
binary with the argument commands/file1”. In addition to being incorrect, this behavior
may bypass alias checks, and it may cause other unintended behaviors if a command prefix
is configured.

If the useFullPath configuration setting is off, the command need not pass the existence
check. The attack would not rely on a binary and subdirectory having similar names, and
the attack will succeed on a much wider variety of directory structures.

Impact

Users of the org.eclipse.jetty.servlets.CGI Servlet with a very specific command structure may have the wrong command executed.

Patches

No patch.
In Jetty 9.x, 10.x, and 11.x the org.eclipse.jetty.servlets.CGI has been deprecated.
In Jetty 12 (all environments) the org.eclipse.jetty.servlets.CGI has been entirely removed.

Workarounds

The org.eclipse.jetty.servlets.CGI Servlet should not be used. Fast CGI support is available instead.

References

• #9516
• #9889
• #9888