CVE-2018-8238 Security feature bypass in Microsoft Lync

What is CVE-2018-8238?

CVE-2018-8238 is a high-severity vulnerability in Microsoft Lync, published on 11 Jul 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A security feature bypass vulnerability exists when Skype for Business or Lync do not properly parse UNC path links shared via messages, aka "Skype for Business and Lync Security Feature Bypass Vulnerability." This affects Skype, Microsoft Lync.

Which versions are affected by CVE-2018-8238?

It affects 2 products.

Products include Microsoft Lync, Microsoft Skype for Business.

How do I fix CVE-2018-8238?

No fix has been published for CVE-2018-8238 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-8238 being exploited?

There is no known exploitation of CVE-2018-8238 in the wild and no public exploit code.

Other vulnerabilities in Microsoft Lync

• CVE-2020-1025 Microsoft Office Elevation of Privilege Vulnerability Critical 9.8
• CVE-2013-1302 Use after free in n/a Critical 9.3
• CVE-2012-1849 Path traversal in n/a Critical 9.3
• CVE-2018-8311 Code injection in Microsoft Lync High 8.8
• CVE-2017-11786 Auth bypass in Skype for Business High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-v74r-x7x3-53vj.