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Well… I have a full time job and cannot test things fully. In this case, and under the assumption, that the most recent 7-Zip version is used, it should be safe to use that tool. To avoid DLL hijacking, I also recommend, not to use the 7-Zip. So the risks mentioned above, ware no longer valid (as long, as ASLR and DEP are active). Newer versions of 7-Zip are using nwo build options like ASLR and DEP. This leaves me with at this point to the recommendation, to avoid using this tool – until it's hardened against attacks to unknown vulnerabilities.Īddendum: This article has been written early 2018. Apparently, it is currently not enabled because 7-Zip is linked with an obsolete linker that doesn't support the flag.Īnd there's a problem with this: 7-Zip is free of charge, but its author uses outdated development tools and wants to save a few bytes in the program file at the expense of security. At least he will try to enable /NXCOMPAT for the next release. Moreover, he doesn't want to enable /GS, because it could affect the runtime as well as the binary size. However, he refused to enable /DYNAMICBASE because he prefers to ship the binaries without relocation table to achieve a minimal binary size. I have discussed this issue with Igor Pavlov and tried to convince him to enable all three flags. Beside the article in in landave's blog I know from another trustable security researcher, that Igor Pavlov has been informed about that potential security risks. So there are no checks for stack overflows. The author of the linked blog post writes, that 7-Zip was compiled also without the /GS flag. This has been described in landave's blog – and the image posted above shows, that DEP is deactivated permanently.
#7zip or winrar windows 7
And DEP is enabled only on 64-bit Windows 7 systems and in the 32-bit version of Windows 10. This means that 7-Zip runs on all Windows systems without ASLR.
Igor Patchev refuses since years to link 7-Zip binary files with the options /NXCOMPAT and /DYNAMICBASE. There are other techniques (like compiler options to check for buffer overflow in executable code) of this kind, some of which have been known for many years. This Microsoft document introduces two such options for improving application security.
#7zip or winrar software
To harden software with respect to the exploitability of unknown vulnerabilities, developers can specify different options when linking modules to an executable binary file. The developer of this tool refuse to hardening its software against unknown security vulnerabilities. In the following consideration, however, I exclude this scenario because of its complexity. If you need to use older, vulnerable 7-zip variants (why ever) on your system, you could fix the vulnerabilities CVE-2017-17969 and CVE-2018-5996 with micro-patches from (see their blog post). This would be the' first thorn' in terms of security, although many users there, admittedly, are not aware of any of the dilemma' 7-Zip variant with security vulnerabilities working on my system' or have little or no influence on this issue. There older versions of the libraries or the program could be installed or updated on the system (without the user`s knowledge). And even third-party providers sometimes use 7-Zip (or sub-functions) in their programs. However, there are some scenarios where older versions of 7-Zip are used. Igor Pavlov had reacted quickly after discovering the vulnerabilities and provided version 18.01 of 7-Zip.
#7zip or winrar update
I recently posted the article 7-Zip vulnerable – update to version 18.01 about vulnerabilities in this tool and recommended an update to version 18.0 and higher. Unfortunately, security vulnerabilities in 7-Zip and the subordinate libraries with packing functions are found again and again. That's generous, so it isn't easy to criticize. 7-Zip and vulnerabilitiesħ-Zip is developed by Igor Pavlov and made available free of charge. This is something no user expects from 7-Zip, but it is not unrealistic. Or, to put it another way: The user tries to unpack a file, and a malware contained in the file becomes active and manipulates the files accessible under the user account. For this purpose, memory overflows must be provoked during unpacking, which can possibly be misused to execute the code. malware) could exploit vulnerabilities in 7-Zip & Co.
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Unfortunately, there is a problem with this function: The content of the archive files to be unpacked (i.
The following figure shows the supported formats that can be associated to 7-Zip. The core function of a program such as 7-Zip is unpacking of archive files, whereby various formats are to be supported.
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