Due to incorrect buffer length declaration in Vala bindings for the Gst.MapInfo() function in Vala versions 0.26.0 and 0.26.1, binaries that use that function are vulnerable to heap buffer overflow, which may result in a crash or arbitrary code execution depending on the binary. All binaried built with the buggy bindings package that use Gst.MapInfo() function are affected. Binaries such as shotwell-video-thumbnailer run this function on untrusted input, which probably makes this bug fairly easy to exploit. How reproducible: This bug is always observable on e.g. shotwell-video-thumbnailer when building the binary with the buggy bindings with Address Sanitizer. Steps to Reproduce: 1. Build Shotwell vith a vulnerable Vala version and -fsanitize=address C compiler flag 2. Run "shotwell-video-thumbnailer /home/user/any-video.webm" 3. Observe the crash Alternatively, you can observe shotwell-video-thumbnailer output garbage instead of valid thumbnails when built with the buggy bindings without Address Sanitizer. Additional info: A patch for the issue is available: https://git.gnome.org/browse/vala/commit/?id=3092537db65887e24a3d3e87a27caf9c5295e4f7 The issue was fixed in vala git master but not identified as a security vulnerability until I've independently discovered it. To mitigate it, the patch above should be applied to the bindings and then all binaries using Gst.MapInfo() have to be rebuild with the fixed bindings. I'm going to submit the information about this bug to distros for CVE allocation, which means it will be disclosed on the 12th of January. If you need more time to identify, rebuild and re-upload affected packages, please let me know ASAP!
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Fedora 21 changed to end-of-life (EOL) status on 2015-12-01. Fedora 21 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.