CVE-2020-24046

moderate-risk
Published 2020-09-17

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.

Do I need to act?

~
3.6% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.2/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Titanhq

References (8)

Third Party Advisory https://github.com/felmoltor
Exploit https://sensepost.com/blog/2020/clash-of-the-spamtitan/
Third Party Advisory https://twitter.com/felmoltor
Vendor Advisory https://www.titanhq.com
Third Party Advisory https://github.com/felmoltor
Exploit https://sensepost.com/blog/2020/clash-of-the-spamtitan/
Third Party Advisory https://twitter.com/felmoltor
Vendor Advisory https://www.titanhq.com
38
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 7/34 · Low
Exposure 5/34 · Minimal