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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.165 -- FreeBSD-SA-00:31.canna Canna port contains remote vulnerability 7 July 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Canna Vendor: FreeBSD Ports Collection Operating System: FreeBSD Linux Unix Platform: N/A Impact: Execute Arbitrary Code/Commands Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-00:31 Security Advisory FreeBSD, Inc. Topic: Canna port contains remote vulnerability Category: ports Module: Canna Announced: 2000-07-05 Affects: Ports collection. Corrected: 2000-06-29 Credits: Shadow Penguin Security <http://shadowpenguin.backsection.net/advisories/index.html> Vendor status: Contacted FreeBSD only: NO I. Background Canna is a Kana-Kanji conversion server. II. Problem Description The Canna server contains an overflowable buffer which may be exploited by a remote user to execute arbitrary code on the local system as user 'bin'. The Canna 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 3400 third-party applications in a ready-to-install format. The ports collection shipped with FreeBSD 3.5 contains this vulnerability since it was discovered after the 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 can run arbitrary code as user 'bin' on the local system. Depending on the local system configuration, the attacker may be able to upgrade privileges further by exploiting local vulnerabilities. If you have not chosen to install the Canna port/package, then your system is not vulnerable to this problem. IV. Workaround One of the following: 1) Deinstall the Canna port/package, if you you have installed it. 2) Consider limiting remote access to the Canna server using ipfw(8) or ipf(8). V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the Canna port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/japanese/Canna-3.2.2.tar.gz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/japanese/Canna-3.2.2.tar.gz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/japanese/Canna-3.2.2.tar.gz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/japanese/Canna-3.2.2.tar.gz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/japanese/Canna-3.2.2.tar.gz Note: it may be several days before updated packages are available. 3) download a new port skeleton for the Canna 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/packages/devel/portcheckout-1.0.tgz - -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBOWGuplUuHi5z0oilAQGcMQP/fYz0XD3LOIgI+ruamllnS7/OIlX0HNUj TewcALZQ+bb8MDKFfpxGRcj3kISskPVmrNmBl79TmL+sWej4wf6DlkuuzOmF/B1P lEoDP6W2NxRPGV5XHCP5x8iVMDi05KNObilCwre2wEYu0y0votn8u8VNO3QO7wUC D1tZJJSMr68= =i/6q - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- 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: auscert@auscert.org.au 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 iQCVAwUBOXXT8Ch9+71yA2DNAQHhGAP+MZg5SqfTH1QyvE+jS8/dzSb3wTlw8qWS Bppk1WMYZso3cUYuGxGrKAEA5Kxh0jMlzCZsTBWPuxp+Mp6HQy8hBoStpfA2Zk18 ycGYKBVtxkXLapChG3aevrJqBTwzFD6ABZM1NxhIBUgfS+ePh3RFvMLB5ZztgIjv 9UjinU3buP0= =3Hib -----END PGP SIGNATURE-----