FreeBSD Security Advisories
2001-Jul-10 07:37 UTC
FreeBSD Ports Security Advisory FreeBSD-SA-01:47.xinetd
-----BEGIN PGP SIGNED MESSAGE----- ============================================================================FreeBSD-SA-01:47 Security Advisory FreeBSD, Inc. Topic: xinetd contains multiple vulnerabilities Category: ports Module: xinetd Announced: 2001-07-10 Credits: zen-parse@gmx.net Affects: Ports collection prior to the correction date. Corrected: 2001-06-30 Vendor status: Updated version released FreeBSD only: NO I. Background xinetd is a replacement for inetd, the internet super-server. II. Problem Description The xinetd port, versions prior to xinetd-2.3.0, contains a potentially exploitable buffer overflow in the logging routines. If xinetd is configured to log the userid of remote clients obtained via the RFC1413 ident service, a remote user may be able to cause xinetd to crash by returning a specially-crafted ident response. This may also potentially execute arbitrary code as the user running xinetd, normally root. In addition, xinetd used a default umask of 0. This may inadvertently cause applications started by xinetd to create world-writable files unless the applications explicitely set the umask. The xinetd port is not installed by default, nor is it "part of FreeBSD" as such: it is part of the FreeBSD ports collection, which contains over 5400 third-party applications in a ready-to-install format. The ports collection shipped with FreeBSD 4.3 is vulnerable to this problem since it was discovered after its release. FreeBSD makes no claim about the security of these third-party applications, although an effort is underway to provide a security audit of the most security-critical ports. III. Impact Remote users may be able to cause xinetd to crash and potentially execute arbitrary code as the user running xinetd. Processes started by xinetd may inadvertently use a umask of 0, causing files created by these processes to by world-writable. If you have not chosen to install the xinetd port/package, then your system is not vulnerable to this problem. IV. Workaround Deinstall the xinetd port/package if you have installed it. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the xinetd port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from the following directories: [i386] ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/security/xinetd-2.3.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/security/xinetd-2.3.0.tgz [alpha] Packages are not automatically generated for the alpha architecture at this time due to lack of build resources. 3) download a new port skeleton for the xinetd port from: http://www.freebsd.org/ports/ and use it to rebuild the port. 4) Use the portcheckout utility to automate option (3) above. The portcheckout port is available in /usr/ports/devel/portcheckout or the package can be obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: FreeBSD: The Power To Serve iQCVAwUBO0sPDlUuHi5z0oilAQFOnAQAnzylUXvLsBiT2F5Mfwn94nd/r7nrP1WI a7hVwyXSYlfBXRFzsyUQsn1ED/t6mNzDKAiztZ7ZzsIfLxgcy7vFyzWmJSqEx6kk pPYzx2KXxB6FXbrSoX1Q4a5WgqWONgFEcG1Vua3nVmApdF0gy8XWinV9I0VWdlVY hQjelLjBi1U=umCA -----END PGP SIGNATURE----- This is the moderated mailing list freebsd-announce. The list contains announcements of new FreeBSD capabilities, important events and project milestones. See also the FreeBSD Web pages at http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-announce" in the body of the message