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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2001.291 -- FreeBSD-SA-01:47.xinetd xinetd contains multiple vulnerabilities 12 July 2001 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: xinetd Vendor: FreeBSD Ports Collection Operating System: FreeBSD BSD Linux Unix Platform: Alpha i386 Impact: Denial of Service Root Compromise Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----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: firstname.lastname@example.org 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----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to email@example.com and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: firstname.lastname@example.org Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBO03Qhyh9+71yA2DNAQGQJQQAnShxRv6GCJLZixB1zyztw8/trhdya0mU aexTfFIUhPfhCd5hNYq/fv7E/l42rp+66S8xgbv6SxR6w38Q0kmDKLPvHZzkkHeD 64z4Xm4Oses9Lj6UD8Z5VEBJ7imqJDgL/BGAxXSALlWd/49rLSjdtYN+AjPP97kq EYKPUfqe90Q= =u0ea -----END PGP SIGNATURE-----