Description of the security update for the information disclosure vulnerability in Visual Studio 2015 Update 3: April 10, 2018

Applies to: Visual Studio 2015 Update 3

Summary


An information disclosure vulnerability exists when Visual Studio improperly discloses limited contents of uninitialized memory while compiling program database (PDB) files. An attacker who exploits the vulnerability could view uninitialized memory from the computer that is used to compile a program database file.

To learn more about the vulnerability, see CVE-2018-1037.

How to obtain and install the update


Method 1: Microsoft Download

The following file is available for download:

Download Download the hotfix package now.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

More Information


Prerequisites

To apply this security update, you must have Visual Studio 2015 Update 3 installed.

Restart requirement

You may have to restart the computer after you apply this security update if an instance of Visual Studio is being used.

Security update replacement information

This security update doesn't replace other security updates.

Issues that are fixed in this security update

This security update addresses the PDB issue that is described in CVE-2018-1037, in which a PDB file may contain uninitialized heap content in a process that updates an existing PDB file, such as mspdbsrv.exe. We strongly recommend that you use the updated PDBCopy tool to check every existing PDB that you intend to share or distribute.

Issues that are not fixed by this security update

If you're using the /DEBUG:fastlink linker option to build your projects or solutions and you're using mspdbcmf.exe to convert linker-generated fastlink PDB files into full PDB files, the resulting full PDB files could also have this information-disclosure vulnerability. To obtain an update to Visual Studio 2015 mspdbcmf.exe, go to this Knowledge Base article.

If you also use Visual Studio 2017, you can use the mspdbcmf.exe that is included in the latest Visual Studio 2017 preview or update to convert fastlink PDB files that are generated by the Visual Studio 2015 linker. (PDBs generated by the latest Visual Studio 2017 mspdbcmf.exe are not vulnerable.)

File information