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Severe Flaws Found In Libarchive Open Source Library (talosintel.com)
Reader itwbennett writes: Researchers from Cisco Systems' Talos group have found three memory corruption errors in the widely used open-source library libarchive that can result in arbitrary code execution and can be exploited by passing specially crafted files to applications that contain the vulnerable code. "The library is used by file and package managers included in many Linux and BSD systems, as well as by components and tools in OS X and Chrome OS," writes Lucian Constantin. "Developers can also include the library's code in their own projects, so it's hard to know how many other applications or firmware packages contain it." (Original blog post) So, while the libarchive maintainers have released patches for the flaws, it will likely take a long time for them to trickle down through all the affected projects.
They are in git, indeed:
CVE-2016-4300: https://github.com/libarchive/...
CVE-2016-4301: https://github.com/libarchive/...
CVE-2016-4302: https://github.com/libarchive/...
append .patch to the url in order to get an apply-able patch.
But better update the whole library, usually there is lots of security related fixing going on when a security researcher takes a look at the code. Also, the git commit log may lie, and in fact some other commits fixed the issue, its just not marked this prominently.
The best policy is always to not copy the whole library into your source tree, but making downloading the library part of the build process. If you have to modify the library some way, its best to upstream those changes, but if you don't want to do it for some reason, or can't do it, then you can create patch files, and apply the patches as part of the build process as well. Updating the library then gets as easy as changing an url and rebuilding + checking that all the patches applied + retesting.