Date: Wed, 13 Jul 2011 17:23:58 -0400 (EDT) From: "Steven M. Christey" <coley@...-smtp.mitre.org> To: oss-security@...ts.openwall.com Subject: Re: Apache symlink issue: can documented behavior be a security problem and hence get a CVE? Very rarely, we will cover "documented behavior" if there is sufficient evidence of widespread abuse/misuse of that behavior by admins, in which case the CVE description would emphasize the fact that it is the admin's "fault" or "misconception." I generally try to stay away from edge cases (such as this one) that could have a "snowball effect" of setting a precedent that could ultimately be used to argue for assigning too many low-priority CVEs to many issues. I would be inclined to avoid assigning a CVE for this issue unless someone can provide a realistic, relatively common scenario under which this would pose a significant security problem. Speaking of Apache, the well-known double-extension handling issue that enables arbitrary upload/execution of dangerous files like abc.php.gif also doesn't have a CVE [I don't think] for similar reasons, that it is well-documented behavior. - Steve On Tue, 12 Jul 2011, Josh Bressers wrote: > I'm going to leave this one for MITRE. > > Thanks. > > -- > JB > > ----- Original Message ----- >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> Hello List, >> >> Is it possible to assign a CVE for documented behavior? Communication >> with apache security showed, that following symlinks to arbitrary >> locations is a documented feature, even when "-FollowSymLink" option >> is >> in place. This allows any user with, that can modify some content >> served >> by apache to access any content accessible by the apache process, also >> content not visible to the user (e.g. outside the ftp-upload directory >> or forbidden like /proc/http-pid/maps). Due to the small window of >> opportunity, this might be relevant mostly when user can already >> execute >> code on the machine, so it is not a big issue. /proc/<pid>/mem is >> protected, when apache is running with setuid, so key material cannot >> be >> extracted using range headers. PUT was not tested so far. >> >> See also >> >> http://www.halfdog.net/Security/2011/ApacheNoFollowSymlinkTimerace/ >> >> - -- >> http://www.halfdog.net/ >> PGP: 156A AE98 B91F 0114 FE88 2BD8 C459 9386 feed a bee >> -----BEGIN PGP SIGNATURE----- >> Version: GnuPG v1.4.6 (GNU/Linux) >> >> iD8DBQFOHC4exFmThv7tq+4RAooyAJ9Vh7F49em+AVT1HosEquCPS+olqQCfdVCO >> PDcCdoHHWTCHe53U+XTzefY= >> =fVzn >> -----END PGP SIGNATURE----- >
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