#VU13789 Improper input validation in Skype for Business and Microsoft Lync


Published: 2018-07-10 | Updated: 2018-07-10

Vulnerability identifier: #VU13789

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8238

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Skype for Business
Client/Desktop applications / Messaging software
Microsoft Lync
Client/Desktop applications / Messaging software

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to improper validation of UNC path links shared via messages. A remote attacker can construct a specially crafted link to file, trick the victim into clicking on that link and execute arbitrary code on the target system with privileges of the current user.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Skype for Business: 2016

Microsoft Lync:


External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8238


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.


Latest bulletins with this vulnerability