A untrusted search path issue was found in Calibre at devices/linux_mount_helper.c leading to the ability of unprivileged users to execute any program as root.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-4125
• https://bugs.launchpad.net/calibre/+bug/885027
• https://git.zx2c4.com/calibre-mount-helper-exploit/about/
• https://lwn.net/Articles/464824/
• https://www.openwall.com/lists/oss-security/2011/11/02/2