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ASKEY RTF3505VW-N1 Privilege Escalation

ASKEY RTF3505VW-N1 Privilege Escalation
Posted Jan 20, 2023
Authored by Leonardo Nicolas Servalli

ASKEY routers version RTF3505VW-N1 suffer from a local privilege escalation vulnerability.

tags | exploit, local
SHA-256 | f9965ccc5dcd57f3e65a484ff64229ecc3616041f5f58399c8f18a9f6071866b

ASKEY RTF3505VW-N1 Privilege Escalation

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# Exploit Title: ASKEY RTF3505VW-N1 - Privilege escalation
# Date: 07-12-2022
# Exploit Author: Leonardo Nicolas Servalli
# Vendor Homepage: www.askey.com
# Platform: ASKEY router devices RTF3505VW-N1
# Tested on: Firmware BR_SV_g000_R3505VMN1001_s32_7
# Vulnerability analysis: https://github.com/leoservalli/Privilege-escalation-ASKEY/blob/main/README.md

#Description:
#----------

# ASKEY RTF3505VW-N1 devices are provided with access through ssh into a restricted default shell (credentials are on the back of the router and in some cases these routers use default credentials).

# The command “tcpdump” is present in the restricted shell and do not handle correctly the -z flag, so it can be used to escalate privileges through the creation of a local file in the /tmp directory of the router, and injecting packets through port 80 (used for the router's Web GUI) with the string ";/bin/bash" in order to be executed by "-z sh". By using “;/bin/bash” as injected string we can spawn a busybox/ash console.



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