Date: Sun, 06 Nov 2011 20:11:50 -0700 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com CC: "Jason A. Donenfeld" <Jason@...c4.com> Subject: Re: Re: CVE request for Calibre On 11/04/2011 02:45 PM, Jason A. Donenfeld wrote: > Just do clarify: Issues 1 through 7.1 (8 issues) were released with the > current version that has been out for quite some time now. These require a > CVE. Issues 8 through 14 are ones introduced only during development and So to confirm these issues will be assigned a CVE (double checking since this has been quite the mess): > were not released, and do not need a CVE. > > So where does that leave us with the CVEs? Well, there are the issues that > were "released" with a "version" of Calibre, and then the trove of bugs he > introduced in the middle. I'll try to recap and separate which is which: > > 1. Ability to create root owned directory anywhere. The mount helper calls > mkdir(argv, ...). > > 2. Ability to remove any empty directory on the system. > > 3. Ability to create user_controlled_dir/.created_by_calibre_mount_helper > anywhere on the filesystem. > > 4. Ability to delete user_controlled_dir/.created_by_calibre_mount_helper > anywhere on the filesystem. > > 5. Ability to inject arguments into 'mount' being exec'd. On lines 78, 81, > and 83, the final two arguments to mount are user controlled. On lines > 1033, 106, 108, 139, and 141, the last argument to unmount/eject is user > controlled. The "exists()" check can be subverted via race condition or by > creating an existing file in the working directory with a filename equal to > the desired injected argument. > > 6. Ability to execute any program as root. The mount helper makes use of > execlp on lines 78, 81, 83, 103, 106, 108, 139, and 141, and the first > argument does not start with a / character. Because of this, execlp will > search PATH for the executable to run. PATH is user controlled, and thus it > is trivial to write a program that spawns a shell and give it "mount" as a > filename, and direct PATH to its directory. > > 7. Ability to mount any device to anywhere. This leads to local root, since > you can mount over /etc/ or /etc/pam.d/ or choose-your-own-adventure. > > 7.1. Ability to unmount any device. -- -Kurt Seifried / Red Hat Security Response Team
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