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Capec-256 Detail

SOAP Array Overflow

Detailed Software Typical Severity: High

Parents: 100

Threats: T62

Description

An attacker sends a SOAP request with an array whose actual length exceeds the length indicated in the request. If the server processing the transmission naively trusts the specified size, then an attacker can intentionally understate the size of the array, possibly resulting in a buffer overflow if the server attempts to read the entire data set into the memory it allocated for a smaller array.

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External ID Source Link Description
CAPEC-256 capec https://capec.mitre.org/data/definitions/256.html
CWE-805 cwe http://cwe.mitre.org/data/definitions/805.html
35 WASC http://projects.webappsec.org/SOAP-Array-Abuse SOAP Array Abuse
REF-102 reference_from_CAPEC http://www.xml.org/xml/news/archives/archive.11292006.shtml Robin Cover, ed., XML and Web Services In The News, XML Daily Newslink
REF-103 reference_from_CAPEC http://www.w3.org/TR/2000/NOTE-SOAP-20000508/#_Toc478383522 Simple Object Access Protocol (SOAP) 1.1, 2006--11---29, W3C
Explore

  1. Identify target application: The adversary identifies a target application to perform the buffer overflow on. In this attack, adversaries look for applications that utilize SOAP as a communication mechanism.

Experiment

  1. Find injection vector: The adversary identifies an injection vector to deliver the excessive content to the targeted application's buffer.

    2. Techniques
    The adversary creates a SOAP message that incorrectly specifies the size of its array to be smaller than the size of the actual content by a large margin and sends it to the application. If this causes a crash or some unintended behavior, it is likely that this is a valid injection vector.

  2. Craft overflow content: The adversary crafts the content to be injected. If the intent is to simply cause the software to crash, the content need only consist of an excessive quantity of random data. If the intent is to leverage the overflow for execution of arbitrary code, the adversary crafts the payload in such a way that the overwritten return address is replaced with one of the adversary's choosing.

    3. Techniques
    Create malicious shellcode that will execute when the program execution is returned to it.
    Use a NOP-sled in the overflow content to more easily "slide" into the malicious code. This is done so that the exact return address need not be correct, only in the range of all of the NOPs
    The adversary will choose a SOAP type that allows them to put shellcode into the buffer when the array is read into the application.
Exploit

  1. Overflow the buffer: Using the injection vector, the adversary sends the crafted SOAP message to the program, overflowing the buffer.

  1. The targeted SOAP server must trust that the array size as stated in messages it receives is correct, but read through the entire content of the message regardless of the stated size of the array.
  1. The attacker must be able to craft malformed SOAP messages, specifically, messages with arrays where the stated array size understates the actual size of the array in the message.

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