CVE-2017-6339

moderate-risk
Published 2017-04-05

Trend Micro InterScan Web Security Virtual Appliance (IWSVA) 6.5 before CP 1746 mismanages certain key and certificate data. Per IWSVA documentation, by default, IWSVA acts as a private Certificate Authority (CA) and dynamically generates digital certificates that are sent to client browsers to complete a secure passage for HTTPS connections. It also allows administrators to upload their own certificates signed by a root CA. An attacker with low privileges can download the current CA certificate and Private Key (either the default ones or ones uploaded by administrators) and use those to decrypt HTTPS traffic, thus compromising confidentiality. Also, the default Private Key on this appliance is encrypted with a very weak passphrase. If an appliance uses the default Certificate and Private Key provided by Trend Micro, an attacker can simply download these and decrypt the Private Key using the default/weak passphrase.

Do I need to act?

~
2.7% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
!
1 public exploit available
42013
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Trendmicro

References (6)

Third Party Advisory http://www.securityfocus.com/bid/97492
Patch https://success.trendmicro.com/solution/1116960
Exploit https://www.qualys.com/2017/01/12/qsa-2017-01-12/qsa-2017-01-12.pdf
Third Party Advisory http://www.securityfocus.com/bid/97492
Patch https://success.trendmicro.com/solution/1116960
Exploit https://www.qualys.com/2017/01/12/qsa-2017-01-12/qsa-2017-01-12.pdf
42
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 13/34 · Low
Exposure 5/34 · Minimal