Synopsis
While developing a plugin to detect PAN-SA-2016-0005, Tenable discovered a different vulnerability in the panUserLogin() function within panmodule.so that could result in an unauthenticated remote DoS. The PAN-OS function calls the glibc strcpy_chk() function to copy a user-supplied username and password to a buffer. If the 'username' parameter exceeds 0x100 bytes or the 'password' parameter exceeds 0x80 bytes, strcpy_chk() causes the process to terminate. When the process terminates, it is re-spawned by its parent process, so it may not be obvious that process had died and may be a partial DoS scenario like previous. However, the log will show it had:
2016-03-19 01:21:34.256 -0400 INFO: appweb: exited, Core: True, Exit signal: SIGABRT
2016-03-19 01:21:48.875 -0400 INFO: appweb: process running with pid 6700
This has been tested on PAN-OS 7.0.1 running on a VM-series firewall.
Solution
Palo Alto has released version 7.0.8 and 7.1.0 to address this issue.
Additional References
https://www.paloaltonetworks.com/documentation/70/pan-os/pan-os-release-notes/pan-os-7-0-8-addressed-issues#78342http://securityadvisories.paloaltonetworks.com/Home/Detail/41
Disclosure Timeline
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