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[R1] HPE LoadRunner libxdrutil.dll mxdr_string() Function XDR String Handling Remote Heap Buffer Overflow



While examining the protocol used by the LoadRunner agent to develop Nessus detection plugins for previous vulnerabilities, Tenable found a heap buffer overflow issue that may allow for remote code execution. The flaw is in the mxdr_string() function of the libxdrutil.dll library. An attacker can craft an XDR string with a very large length (i.e., 0xfffffffc), which when processed in libxdrutil.dll!mxdr_string(), the function ends up allocating 0xffffffffc + 5 = 1 byte from the heap, which causes a small buffer to be returned. Next, the function copies 0xfffffffc bytes of attacker-controlled data to the small buffer, resulting in a heap buffer overflow. Technical shared the technical debugging / crash pleasantry with ZDI.

This was tested against HPE LoadRunner 12.53.0 running on 32-bit Windows 2008 SP2. Tenable generated a Python PoC script (loadrunner_mxdr_string_heap_overflow.py) that demonstrates this issue. If you are with ZDI you have a copy. Otherwise, sorry!


HPE has released both HPE LoadRunner 12.53.0 Patch 4 and HPE Performance Center 12.53.0 Patch 4 to address this issue. They do not explicitly say it, but we assume Patch levels 1 to 3 would be vulnerable.

Disclosure Timeline

2016-06-21 - Issue discovered
2016-06-21 - Submitted to ZDI, case bmartin0014 opened
2016-07-20 - Ping ZDI for update
2016-07-20 - ZDI replies, their case load is huge, preparing for BlackHat, will get back ASAP
2016-07-29 - ZDI offers $1000 for this work
2016-07-29 - Tenable accepts
2016-07-29 - ZDI confirms
2016-11-30 - Vulnerability reported to vendor by ZDI
2017-03-07 - HP advisory posted
2017-03-09 - ZDI advisory posted

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Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

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