Nom du paquet
modutils
Date
2000-11-16
Advisory ID
MDKSA-2000:071
Affected versions
7.1 i586 , 7.2 i586

Problem description

All 2.3.x versions of modutils (since March 12 1999) contain a vulnerability that can lead to a local root compromise. The modprobe program uses popen() to execute the "echo" program argumented with user input. Because popen() relies on /bin/sh to parse the command string and execute "echo", un-escaped shell meta-characters can be included in user input to execute commands. Although modprobe is not installed setuid root, this vulnerability can be exploited to gain root access provided the target system is using kmod. Kmod is a kernel facility that automatically executes the program modprobe when a module is requested via request_module(). One program that can take advantage of this vulnerability is ping. When a device is specified at the command line that doesn't exist, request_module is called with the user-supplied arguments passed to the kernel. The kernel then takes the arguments and executes modprobe with them. Arbitrary commands included in the argument for module name (device name to ping) are then executed when popen() is called as root. A new version of modutils (2.3.20) has been released that fixes this particular vulnerability. modutils still supports meta expansion, including back quoted commands, but only for data read from the configuration file. This assumes that when modutils is run as root out of the kernel, normal users cannot specify their own configuration files.

Updated packages

7.1 i586

 de9f58e8def6af9174eb53227422bb70  7.1/RPMS/modutils-2.3.20-1.2mdk.i586.rpm
05f7919a3353537fe97f0405120bb0f7  7.1/SRPMS/modutils-2.3.20-1.2mdk.src.rpm

7.2 i586

 83071582ed7ae9dbe93f13a386c9f500  7.2/RPMS/modutils-2.3.20-1.1mdk.i586.rpm
a1fb2ec6a86c131a3ae2b45bca976e31  7.2/SRPMS/modutils-2.3.20-1.1mdk.src.rpm