2010
12.14

Symantec Endpoint Protection – crypt32 errors

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One of the most procrastinated issues I had at a Customer’s, was the proliferation of errors like these (as shown in servers/clients Event Viewer):

Event Type: Error
Event Source:   crypt32
Event Category: None
Event ID:   8
Description:
Failed auto update retrieval of third-party root list sequence number from: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt> with error: This network connection does not exist.
Event Type: Error
Event Source:   crypt32
Event Category: None
Event ID:   11
Description:
Failed extract of third-party root list from auto update cab at: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab> with error: A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.

There are several posts mentioning the issue, this one pointed me in the right direction. Basically, because of how SEP components communicate, Windows is triggered into updating the list of trusted root Certification Authorities. It tries to do so through the Internet using the Computer account. The latter may not have any proxy configured. Being unable to reach outside, the host gets flooded by crypt32 errors.

In order to solve the issue, I decided to deploy a valid proxy configuration, for the Computer account (SYSTEM user), on a subset of the Domain’s hosts.
One of the ways to script that is the “proxycfg -u” command1 that works by copying the current user proxy settings to the SYSTEM’s registry. Sounds cool but if the current user is not a member of the local Administrators group, he won’t have the necessary rights. The following script instead, can be launched via Group Policy2 during operating system startup, and since it’s a startup script rather than a login one, it will run with administrative privileges.

Nothing fancy in the below source. It creates the registry key if it doesn’t exist, then sets the right value for WinHttpSettings which I obtained this way:

  • use “proxycfg -u” on a test host
  • use the Registry editor to export the contents of HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections

The value is of type REG_BINARY. Since the RegWrite API (method of class WScript.Shell) cannot deal with binary values, WMI (StdRegProv registry provider) needs to be used. Also, SetBinaryValue expects an array of decimal values, while Regedit exports them as hexadecimal digits (you’ll have to take care of the conversion yourself).

On Error Resume Next
Const HKEY_LOCAL_MACHINE = &H80000002

strPath = "SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections"
strKey = "WinHttpSettings"
strValue = "24,0,0,0,0,0,0,0,3,0,0,0,19,0,0,0,112,114,111,120,121,46,99,117,115,116,46,108,97,110,58,56,48,56,48,47,0,0,0,49,48,46,42,46,42,46,42,59,115,101,114,118,101,114,50,48,59,115,101,114,118,101,114,50,48,46,42,59,42,46,99,117,115,116,46,108,97,110,59,60,108,111,99,97,108,62"
strMachineName = "."

arrValues = Split(strValue,",")
strMoniker = "winMgmts:\\" & strMachineName & "\root\default:StdRegProv"
Set oReg = GetObject(strMoniker)
rv = oReg.CreateKey(HKEY_LOCAL_MACHINE, strPath)
rv = oReg.SetBinaryValue(HKEY_LOCAL_MACHINE, strPath, strKey, arrValues)

If the scripts works as it should, you’ll be greeted by these events:

Event Type: Information
Event Source:   crypt32
Event Category: None
Event ID:   7
Description:
Successful auto update retrieval of third-party root list sequence number from: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt>
Event Type: Information
Event Source:   crypt32
Event Category: None
Event ID:   2
Description:
Successful auto update retrieval of third-party root list cab from: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab>

And, hopefully, crypt32 errors will be gone for good.

  1. See Using the WinHTTP Proxy Configuration Utility
  2. Computer Configuration, Windows Settings, Scripts, Startup
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