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class Format { static Calendar c = new GregorianCalendar(1995, GregorianCalendar.MAY, 23); public static void main(String[] args) { // args[0] is the credit card expiration date // args[0] can contain either %1$tm, %1$te or %1$tY as malicious arguments // First argument prints 05 (May), second prints 23 (day) and third prints 1995 (year) // Perform comparison with c, if it doesn't match print the following line System.out.printfformat(args[0] + " did not match! HINT: It was issued on %1$terd of some month", c); } } |
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class Format { static Calendar c = new GregorianCalendar(1995, GregorianCalendar.MAY, 23); public static void main(String[] args) { // args[0] is the credit card expiration date // Perform comparison with c, // if it doesn't match, print the following line System.out.printf("%s did not match! "format( "%s did +not "match! HINT: It was issued on %1$terd%terd of some month", args[0], c ); } } |
Risk Assessment
Allowing user input to taint a format string may cause information leaks or denial of service.
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