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Debian: ISDNUtils Critical Exploit for Xmonisdn Security Risk

We have received reports that the version of xmonisdn as distributed in the isndutils package from Debian GNU/Linux 2.1 has a security problem. . -----BEGIN PGP SIGNED MESSAGE----- We have received reports that the version of xmonisdn as distributed in the isndutils package from Debian GNU/Linux 2.1 has a security problem. Xmonisdn is an X applet that shows the status of the ISDN links. You can configure it to run two scripts when the left or right mouse button are clicked on it. Xmonisdn was installed setuid root so that the scripts could do things like add and delete the default route. However is that while the scripts were checked for owner root and not writeable by group or others the scripts are run via the system() library function, which spawns a shell to run it. This means that the scripts are open to attack via IFS and/or PATH manipulation. However, the setuid root isn't necessary anymore as the ISDN system now offers other ways of preventing dialouts besides by manipulating network routes. This can be done by anyone who can access /dev/isdnctrl0 and /dev/isdninfo. On debian systems those are rw for group dialout, so if xmonisdn is run by someone in group dialout, they can execute the necessary isdnctrl commands. wget url will fetch the file for you dpkg -i file.deb will install the referenced file. Debian GNU/Linux 2.1 alias slink - ------------------------------- This version of Debian was released only for Intel, the Motorola 680x0, the alpha and the Sun sparc architecture. Source archives: ils_3.0-12slink13.diff.gz MD5 checksum: 56f4328687b0478c83b49ae8c61d3a24 3.0-12slink13.dsc MD5 checksum: 44ecac14b66830e969ce6e09b3f95e1e g.tar.gz MD5 checksum: 83cb39ed37747367331ec5b433fc7dda Alpha architecture: MD5 checksum: 984e4be2224fcf90261139e2576b2d35 Intel ia32 architecture: MD5 checksum: 6550f5ee476a0c8056acf19f5a1e41fb Sun Sparc architecture: MD5 checksum: 2da71a182ff8955c0822aa9737095c97 For notyet released architectures please refer to the appropriate directory . - -- Debian GNU/Linux . Security Managers . This email address is being protected from spambots. You need JavaScript enabled to view it. This email address is being protected from spambots. You need JavaScript enabled to view it. Christian Hudon . Wichert Akkerman . Martin Schulze . . -----BEGIN PGP SIGNATURE----- Version: 2.6.3ia Charset: noconv iQB1AwUBN7WkVqjZR/ntlUftAQG5vgMArrIlZRpCEfjfOYrxeSFqFTzvrJJLkadE 8alJnI/712OvHcDUQN3bAfXlcCjbSrZH0o/6QS0Omj6iYoULxqQjSiykWeq2hgeL n4Tt7YOncrKGL90zFoZFAJRKxJIR+Xwx =GkF9 -----END PGP SIGNATURE----- . Stay informed about vital developments regarding xmonisdn vulnerabilities within Debian's isdnutils suite. Safeguard your ISDN connections proactively.. isdnutils exploit,debian security update,xmonisdn issue,security patches. . Severity: Critical. LinuxSecurity.com Team

Dec 13, 1999 •Critical Debian