Date: Mon, 4 Aug 2003 17:35:11 -0500 From: "Jacques A. Vidrine" <nectar@FreeBSD.org> To: freebsd-security@FreeBSD.org Subject: IMPORTANT FOR lukemftpd USERS (was Re: FreeBSD Security Advisory FreeBSD-SA-03:08.realpath) Message-ID: <20030804223511.GC11083@madman.celabo.org> In-Reply-To: <200308040004.h7404VVL030671@freefall.freebsd.org> References: <200308040004.h7404VVL030671@freefall.freebsd.org>
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On Sun, Aug 03, 2003 at 05:04:31PM -0700, FreeBSD Security Advisories wrote: > (1) lukemftpd(8), an alternative FTP server: realpath(3) is used to > process the MLST and MLSD commands. [lukemftpd(8) is not built or > installed by default.] [...] > the realpath(3) vulnerability may be > exploitable, leading to arbitrary code execution with the privileges > of the authenticated user. This is probably only of concern on > otherwise `closed' servers, e.g. servers without shell access. [...] I have a correction to make regarding the above text. In the case of lukemftpd (and lukemftpd only), in some situations the vulnerability may be used to execute code with _superuser privileges_. If lukemftpd is NOT invoked with `-r', then it does NOT completely drop privileges when a user logs in. Thus, a successful exploit will be able to regain superuser privileges. Conversely, if lukemftpd IS invoked with `-r', then the original advisory text above applies. The example usage for lukemftpd that was in /etc/inetd.conf prior to 5.1-RELEASE included the `-r' flag, but there is no longer an example in 5.1-RELEASE. I don't think there was ever an example entry for 4.x. I would normally immediately publish a revised advisory with this additional information, however lukemftpd is neither built nor installed by default. Since that is the case, I will probably wait a few days before revision in case further useful information comes to light. Cheers, -- Jacques Vidrine . NTT/Verio SME . FreeBSD UNIX . Heimdal nectar@celabo.org . jvidrine@verio.net . nectar@freebsd.org . nectar@kth.se
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