Microsoft Office OLE DLL Side Loading Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2021-11-03
• EPSS: 43% chance of exploitation in the next 30 days (higher than 99% of CVEs)

[ Description ]Official description

Microsoft Visio 2007 SP3, Visio 2010 SP2, Visio 2013 SP1, Visio 2016, Visio Viewer 2007 SP3, and Visio Viewer 2010 mishandle library loading, which allows local users to gain privileges via a crafted application, aka "Microsoft Office OLE DLL Side Loading Vulnerability."

CISA: Microsoft Office Object Linking & Embedding (OLE) dynamic link library (DLL) contains a side loading vulnerability due to it improperly validating input before loading libraries. Successful exploitation allows for remote code execution.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 3 May 2022): Apply updates per vendor instructions.

• Patch on docs.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ References ]References

• packetstormsecurity.com/files/137490/Microsoft-Visio-DLL-Hijacking.htmlThird Party AdvisoryVDB Entry
• seclists.org/fulldisclosure/2016/Jun/32Broken LinkMailing ListThird Party Advisory
• www.securityfocus.com/archive/1/538685/100/0/threadedBroken LinkThird Party AdvisoryVDB Entry
• www.securitytracker.com/id/1036093Broken LinkThird Party AdvisoryVDB Entry
• docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-070PatchVendor Advisory
• www.securify.nl/advisory/SFY20150804/microsoft_visio_multiple_dll_side_loading_vulnerab…ExploitThird Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource