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Challenge Information - KPRCA_00110

Commonly known as: LazyCalc


Rounds Enabled

49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63

Details

Original Versions

Known Vulnerabilities

  • CWE-121 - Stack-based Buffer Overflow
  • CWEs are listed as indicated by the challenge author.

Deployed patches

Deployed IDS rules

DARPA performer group

Kaprica Security (KPRCA)

Description

A very simple, binary protocol calculator that can do basic binary operations. It provides a way to import the operations and export the results. The results are not computed untill it's told to. The service provides a random base, so that a malicious person cannot figure out the correct value of the computation except for the person who initiated the computation.

Feature List

  • Basic math operations: Add, Sub, Mul, Div, Mod
  • Import and Export
  • Compute

Vulnerability

Vuln 1

The interface requires a number of operations to be done in the beggining. This number determines the size of the heap to be allocated to store the operations (type, arguments and the result). However, when the export feature is used, the contents (the result field of the stored heap structs) are copied to the stack buffer that can hold up to 30 integers. The program lacks the check for the maximum size of the operations, allowing an attacker to cause a stack buffer overflow.

Generic class of vulnerability

Stack Buffer Overflow

CWE classification

CWE-121: Stack-based Buffer Overflow

Challenges

  • There's also a pointer to the heap structure that gets overwritten while overwriting the return address on the stack.
  • This pointer gets free'd before the main function returns, so unless the valid pointer is provided the program aborts while trying to free an invalid pointer.
  • free(0) is a valid operation (virtually no-op), so the attacker needs to ensure that the pointer is overwritten with 0.

Difficulty

  • Discovery: easy
  • Proving: easy
  • Patching: easy

POV Information

Round Source Destination Result POV Analysis Video
50 CSDS CodeJitsu Failed POV POV Watch
50 CSDS DeepRed Failed POV POV Watch
50 CSDS Disekt Failed POV POV Watch
50 CSDS ForAllSecure Failed POV POV Watch
50 CSDS Shellphish Failed POV POV Watch
50 CSDS TECHx Failed POV POV Watch
50 DeepRed CodeJitsu Failed POV POV Watch
50 DeepRed CSDS Failed POV POV Watch
50 DeepRed Disekt Failed POV POV Watch
50 DeepRed ForAllSecure Failed POV POV Watch
50 DeepRed Shellphish Failed POV POV Watch
50 DeepRed TECHx Failed POV POV Watch
51 CodeJitsu Disekt Failed POV through defenses POV Watch
51 CSDS CodeJitsu Failed POV POV Watch
51 CSDS DeepRed Failed POV POV Watch
51 CSDS Disekt Failed POV through defenses POV Watch
51 CSDS ForAllSecure Failed POV POV Watch
51 CSDS Shellphish Failed POV POV Watch
51 DeepRed CodeJitsu Failed POV POV Watch
51 DeepRed CSDS Failed POV POV Watch
51 DeepRed Disekt Failed POV through defenses POV Watch
51 DeepRed ForAllSecure Failed POV POV Watch
51 DeepRed Shellphish Failed POV POV Watch
52 CodeJitsu Shellphish Failed POV through defenses POV Watch
52 CSDS CodeJitsu Failed POV POV Watch
52 CSDS DeepRed Failed POV POV Watch
52 CSDS Disekt Failed POV through defenses POV Watch
52 CSDS ForAllSecure Failed POV POV Watch
52 CSDS Shellphish Failed POV through defenses POV Watch
52 CSDS TECHx Failed POV through defenses POV Watch
52 DeepRed CodeJitsu Failed POV POV Watch
52 DeepRed CSDS Failed POV POV Watch
52 DeepRed Disekt Failed POV through defenses POV Watch
52 DeepRed ForAllSecure Failed POV POV Watch
52 DeepRed Shellphish Failed POV through defenses POV Watch
52 DeepRed TECHx Failed POV through defenses POV Watch
53 CSDS CodeJitsu Failed POV POV Watch
53 CSDS DeepRed Failed POV POV Watch
53 CSDS Disekt Failed POV through defenses POV Watch
53 CSDS ForAllSecure Failed POV POV Watch
53 CSDS Shellphish Failed POV through defenses POV Watch
53 CSDS TECHx Failed POV through defenses POV Watch
53 DeepRed CodeJitsu Failed POV POV Watch
53 DeepRed CSDS Failed POV POV Watch
53 DeepRed Disekt Failed POV through defenses POV Watch
53 DeepRed ForAllSecure Failed POV POV Watch
53 DeepRed Shellphish Failed POV through defenses POV Watch
53 DeepRed TECHx Failed POV through defenses POV Watch
54 CSDS CodeJitsu Failed POV POV Watch
54 CSDS DeepRed Failed POV POV Watch
54 CSDS Disekt Failed POV through defenses POV Watch
54 CSDS ForAllSecure Failed POV POV Watch
54 CSDS Shellphish Failed POV through defenses POV Watch
54 CSDS TECHx Failed POV through defenses POV Watch
54 DeepRed CodeJitsu Failed POV POV Watch
54 DeepRed CSDS Failed POV POV Watch
54 DeepRed Disekt Failed POV through defenses POV Watch
54 DeepRed ForAllSecure Failed POV POV Watch
54 DeepRed Shellphish Failed POV through defenses POV Watch
54 DeepRed TECHx Failed POV through defenses POV Watch
55 CSDS CodeJitsu Failed POV POV Watch
55 CSDS DeepRed Failed POV POV Watch
55 CSDS Disekt Failed POV through defenses POV Watch
55 CSDS ForAllSecure Failed POV POV Watch
55 CSDS Shellphish Failed POV through defenses POV Watch
55 CSDS TECHx Failed POV through defenses POV Watch
55 DeepRed CodeJitsu Failed POV POV Watch
55 DeepRed CSDS Failed POV POV Watch
55 DeepRed Disekt Failed POV through defenses POV Watch
55 DeepRed ForAllSecure Failed POV POV Watch
55 DeepRed Shellphish Failed POV through defenses POV Watch
55 DeepRed TECHx Failed POV through defenses POV Watch
56 CSDS CodeJitsu Failed POV POV Watch
56 CSDS DeepRed Failed POV POV Watch
56 CSDS Disekt Failed POV through defenses POV Watch
56 CSDS ForAllSecure Failed POV POV Watch
56 CSDS Shellphish Failed POV through defenses POV Watch
56 CSDS TECHx Failed POV through defenses POV Watch
56 DeepRed CodeJitsu Failed POV POV Watch
56 DeepRed CSDS Failed POV POV Watch
56 DeepRed Disekt Failed POV through defenses POV Watch
56 DeepRed ForAllSecure Failed POV POV Watch
56 DeepRed Shellphish Failed POV through defenses POV Watch
56 DeepRed TECHx Failed POV through defenses POV Watch
57 CSDS CodeJitsu Failed POV POV Watch
57 CSDS DeepRed Failed POV POV Watch
57 CSDS Disekt Failed POV through defenses POV Watch
57 CSDS ForAllSecure Failed POV POV Watch
57 CSDS Shellphish Failed POV through defenses POV Watch
57 CSDS TECHx Failed POV through defenses POV Watch
57 DeepRed CodeJitsu Failed POV POV Watch
57 DeepRed CSDS Failed POV POV Watch
57 DeepRed Disekt Failed POV through defenses POV Watch
57 DeepRed ForAllSecure Failed POV POV Watch
57 DeepRed Shellphish Failed POV through defenses POV Watch
57 DeepRed TECHx Failed POV through defenses POV Watch
58 CSDS CodeJitsu Failed POV POV Watch
58 CSDS DeepRed Failed POV POV Watch
58 CSDS Disekt Failed POV through defenses POV Watch
58 CSDS ForAllSecure Failed POV POV Watch
58 CSDS Shellphish Failed POV through defenses POV Watch
58 CSDS TECHx Failed POV through defenses POV Watch
58 DeepRed CodeJitsu Failed POV POV Watch
58 DeepRed CSDS Failed POV POV Watch
58 DeepRed Disekt Failed POV through defenses POV Watch
58 DeepRed ForAllSecure Failed POV POV Watch
58 DeepRed Shellphish Failed POV through defenses POV Watch
58 DeepRed TECHx Failed POV through defenses POV Watch
59 CSDS CodeJitsu Failed POV POV Watch
59 CSDS DeepRed Failed POV POV Watch
59 CSDS Disekt Failed POV through defenses POV Watch
59 CSDS ForAllSecure Failed POV POV Watch
59 CSDS Shellphish Failed POV through defenses POV Watch
59 CSDS TECHx Failed POV through defenses POV Watch
59 DeepRed CodeJitsu Failed POV POV Watch
59 DeepRed CSDS Failed POV POV Watch
59 DeepRed Disekt Failed POV through defenses POV Watch
59 DeepRed ForAllSecure Failed POV POV Watch
59 DeepRed Shellphish Failed POV through defenses POV Watch
59 DeepRed TECHx Failed POV through defenses POV Watch
60 CSDS CodeJitsu Failed POV POV Watch
60 CSDS DeepRed Failed POV POV Watch
60 CSDS Disekt Failed POV through defenses POV Watch
60 CSDS ForAllSecure Failed POV POV Watch
60 CSDS Shellphish Failed POV through defenses POV Watch
60 CSDS TECHx Failed POV through defenses POV Watch
60 DeepRed CodeJitsu Failed POV POV Watch
60 DeepRed CSDS Failed POV POV Watch
60 DeepRed Disekt Failed POV through defenses POV Watch
60 DeepRed ForAllSecure Failed POV POV Watch
60 DeepRed Shellphish Failed POV through defenses POV Watch
60 DeepRed TECHx Failed POV through defenses POV Watch
61 CSDS CodeJitsu Failed POV POV Watch
61 CSDS DeepRed Failed POV POV Watch
61 CSDS Disekt Failed POV through defenses POV Watch
61 CSDS ForAllSecure Failed POV POV Watch
61 CSDS Shellphish Failed POV through defenses POV Watch
61 CSDS TECHx Failed POV through defenses POV Watch
61 DeepRed CodeJitsu Failed POV POV Watch
61 DeepRed CSDS Failed POV POV Watch
61 DeepRed Disekt Failed POV through defenses POV Watch
61 DeepRed ForAllSecure Failed POV POV Watch
61 DeepRed Shellphish Failed POV through defenses POV Watch
61 DeepRed TECHx Failed POV through defenses POV Watch
62 CSDS CodeJitsu Failed POV POV Watch
62 CSDS DeepRed Failed POV POV Watch
62 CSDS Disekt Failed POV through defenses POV Watch
62 CSDS ForAllSecure Failed POV POV Watch
62 CSDS Shellphish Failed POV through defenses POV Watch
62 CSDS TECHx Failed POV through defenses POV Watch
62 DeepRed CodeJitsu Failed POV POV Watch
62 DeepRed CSDS Failed POV POV Watch
62 DeepRed Disekt Failed POV through defenses POV Watch
62 DeepRed ForAllSecure Failed POV POV Watch
62 DeepRed Shellphish Failed POV through defenses POV Watch
62 DeepRed TECHx Failed POV through defenses POV Watch
63 CSDS CodeJitsu Failed POV POV Watch
63 CSDS DeepRed Failed POV POV Watch
63 CSDS Disekt Failed POV through defenses POV Watch
63 CSDS ForAllSecure Failed POV POV Watch
63 CSDS Shellphish Failed POV through defenses POV Watch
63 CSDS TECHx Failed POV through defenses POV Watch
63 DeepRed CodeJitsu Failed POV POV Watch
63 DeepRed CSDS Failed POV POV Watch
63 DeepRed Disekt Failed POV through defenses POV Watch
63 DeepRed ForAllSecure Failed POV POV Watch
63 DeepRed Shellphish Failed POV through defenses POV Watch
63 DeepRed TECHx Failed POV through defenses POV Watch

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