Description

A sandbox escape issue was discovered in TitanHQ SpamTitan Gateway 7.07. It limits the admin user to a restricted shell, allowing execution of a small number of tools of the operating system. This restricted shell can be bypassed after changing the properties of the user admin in the operating system file /etc/passwd. This file cannot be accessed though the restricted shell, but it can be modified by abusing the Backup/Import Backup functionality of the web interface. An authenticated attacker would be able to obtain the file /var/tmp/admin.passwd after executing a Backup operation. This file can be manually modified to change the GUID of the user to 0 (root) and change the restricted shell to a normal shell /bin/sh. After the modification is done, the file can be recompressed to a .tar.bz file and imported again via the Import Backup functionality. The properties of the admin user will be overwritten and a root shell will be granted to the user upon the next successful login.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

NIST: NVD

Base Score:  7.2 HIGH

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

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score:  9.0 HIGH

Vector:  (AV:N/AC:L/Au:S/C:C/I:C/A:C)

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://github.com/felmoltor	Third Party Advisory
https://sensepost.com/blog/2020/clash-of-the-spamtitan/	Exploit  Third Party Advisory
https://twitter.com/felmoltor	Third Party Advisory
https://www.titanhq.com	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-269	Improper Privilege Management	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

1 change records found show changes

Initial Analysis by NIST 9/24/2020 9:46:51 AM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:titanhq:spamtitan:7.07:*:*:*:*:*:*:*
Added	CVSS V2		NIST (AV:N/AC:L/Au:S/C:C/I:C/A:C)
Added	CVSS V3.1		NIST AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Added	CWE		NIST CWE-269
Changed	Reference Type	https://github.com/felmoltor No Types Assigned	https://github.com/felmoltor Third Party Advisory
Changed	Reference Type	https://sensepost.com/blog/2020/clash-of-the-spamtitan/ No Types Assigned	https://sensepost.com/blog/2020/clash-of-the-spamtitan/ Exploit, Third Party Advisory
Changed	Reference Type	https://twitter.com/felmoltor No Types Assigned	https://twitter.com/felmoltor Third Party Advisory
Changed	Reference Type	https://www.titanhq.com No Types Assigned	https://www.titanhq.com Vendor Advisory