Privilege escalation in Microsoft Lync
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2017-11786 |
| CWE-ID | CWE-264 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Microsoft Lync Client/Desktop applications / Messaging software |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains one low risk vulnerability.
1) Privilege escalation
EUVDB-ID: #VU8757
Risk: Low
CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-11786
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote authenticated attacker to gain elevated privileges on the target system.
The weakness exists due to when Skype for Business fails to properly handle specific authentication requests. A remote attacker can invite a user to an instant message session while using a malicious profile image, steal an authentication has and gain system privileges.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMicrosoft Lync: 2013
CPE2.3http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11786
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
