[ SOURCE: http://www.secureroot.com/security/advisories/9785948960.html ] -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-00:78 Security Advisory FreeBSD, Inc. Topic: bitchx allows remote code execution Category: ports Module: bitchx Announced: 2000-12-20 Credits: nimrood Affects: Ports collection prior to the correction date. Corrected: 2000-12-12 Vendor status: Updated version released FreeBSD only: NO I. Background bitchx is a popular IRC client. II. Problem Description The bitchx port, versions prior to 1.0c17_1, contains a remote vulnerability. Through a stack overflow in the DNS parsing code, a malicious remote user in control of their reverse DNS records may crash a bitchx session, or cause arbitrary code to be executed by the user running bitchx. The bitchx 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 4200 third-party applications in a ready-to-install format. The ports collections shipped with FreeBSD 3.5.1 and 4.2 contain this problem since it was discovered after the releases. 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 Malicious remote users may execute arbitrary code as the user running bitchx. If you have not chosen to install the bitchx port/package, then your system is not vulnerable to this problem. IV. Workaround Deinstall the bitchx port/package, if you have installed it. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the bitchx 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/irc/BitchX-1.0c17_1.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/irc/BitchX-1.0c17_1.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/irc/BitchX-1.0c17_1.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/irc/BitchX-1.0c17_1.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/irc/BitchX-1.0c17_1.tgz NOTE: It may be several days before updated packages are available. 3) download a new port skeleton for the bitchx 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-3-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.4 (FreeBSD) Comment: For info see http://www.gnupg.org iQCVAwUBOkDAmFUuHi5z0oilAQHj7QP+O0BAQ/wrl5FYqTb63fYO1hDncbWGxn/4 MhH2NTMj3izZS6Kw+oWDq59DspN1wCPTR8BaickNge2E82Kcg1hggXwu/3eRt7y3 FpT5oDZFk9rLSTl+VWsyV3ljA9LA3e7yCc9vnN1+65uQnW1rChUw8Hi2C5Fu5INJ /a+HgmkMcEI= =xnU+ -----END PGP SIGNATURE-----