Denne afhjælpning indebærer brug af et Windows PowerShell-script, som anvender indbyggede Windows scripting-kommandoer.
Disse instruktioner kan anvendes på enhver type Windows DPA-installation, herunder DPA-programmet, DPA-datalageret og standalone DPA Agent (installeret alene på en server eller på en anden type programserver).
Se nedenstående Dell-sikkerhedsmeddelelse for at få flere oplysninger om Apache Log4j-sårbarheder:
Hvis du har spørgsmål eller har brug for hjælp til disse instruktioner, skal du kontakte Dells tekniske support.
Trin til manuel afhjælpning:
Bemærk:
Bemærk: Alternativt leveres hele teksten i filen log4j_jndiremoval.txt i slutningen af denne vejledning, som kan kopieres og indsættes i en tekstfil.
Hvis dette er en agentinstallation på DPA-programmet eller DPA-datalageret i Windows PowerShell-vinduet, er kommandoen:
dpa-agent stop
Hvis dette er en enkeltstående DPA-agentinstallation i Windows PowerShell-vinduet, er kommandoen:
\dpa stop
Eksempel:
C:\Program Files\EMC\DPA\agent\etc\dpa stop
Bemærk: DPA-installationsstien skal indtastes igen.
Hvis dette er en agentinstallation på DPA-programmet eller DPA-datalageret i Windows PowerShell-vinduet, er kommandoen:
dpa-agent starter
Hvis dette er en enkeltstående DPA-agentinstallation i Windows PowerShell-vinduet, er kommandoen:
\dpa start
Eksempel:
C:\Program Files\EMC\DPA\agent\etc\dpa start
Tillæg:
Nedenfor er den komplette tekst til PowerShell-scriptet. Hvis filen, der er vedhæftet til denne KB, ikke kan åbnes, kan denne tekst kopieres og indsættes i en tekstfil (.txt) til brug i ovenstående trin.
param ( [switch]$verify ) '--------------------------------------------------------------------------' '--------------------------------------------------------------------------' ' Data Protection Advisor CVE-2021-44228, CVE-2021-45046 Patcher 1.1 ' ' Developer : Pankaj Pande(p.pande@dell.com) ' ' Release : 29 Dec 2021 ' '--------------------------------------------------------------------------' 'Welcome to CVE-2021-44228, CVE-2021-45046 Patching Tool.' 'This utility will assist you in patching Data Protection Advisor for CVE-2021-44228 and CVE-2021-45046 on a Windows system.' "Special Note : The tool automates remediation steps for all internal components. Following remediation, validation checks are also run. While this tool remediates these vulnerabilities, all available information from Apache on log4j continues to be monitored. If new CVEs are discovered, Dell Technologies' Engineering teams will clarify impact and new remediation steps where necessary. If needed this tool will be updated to include the new remediation steps." '---------------------------------------------------------------------------' function List-JndiLookup { Param ( [string[]]$JarFiles, [string] $FilenameToRemove ) #initiate the .net namespace add-type -AssemblyName 'System.IO.Compression.filesystem' "The number of files to be processed is : $($JarFiles.Count)" #list the files we are processing # them later foreach ($JarFile in $JarFiles) { "$JarFile" } $processedFiles = 0; $skippedFiles = 0; foreach ($JarFile in $JarFiles) { # Open the jar for updating (.jar files are just .zip files) try { $ProcessJarFile = [io.compression.zipfile]::Open($JarFile,'Update') } catch { # Error Handling } "Checking $JarFile for $FilenameToRemove" $totalFilesInJar = ($ProcessJarFile.Entries | Where FullName -Match $FilenameToRemove).Count if($totalFilesInJar -gt 0){ $processedFiles++ } #close Zip try { $ProcessJarFile.Dispose() } catch { # Error Handling } } if ( $processedFiles -gt 0) { Write-Host "$processedFiles file(s) found vulnerable" -fore red Write-Host "Finished...Please make sure to run the patching on this sytem" -fore red } else { Write-Host "$processedFiles file(s) found vulnerable" -fore green Write-Host "Finished...No Action needed" -fore green } } function Remove-JndiLookup { Param ( [string[]]$JarFiles, [string] $FilenameToRemove ) #initiate the .net namespace add-type -AssemblyName 'System.IO.Compression.filesystem' "The number of files to be processed is : $($JarFiles.Count)" #list the files we are processing # them later foreach ($JarFile in $JarFiles) { "$JarFile" } "Starting patching/Removel Process" $processedFiles = 0; $skippedFiles = 0; foreach ($JarFile in $JarFiles) { # Open the jar for updating (.jar files are just .zip files) try { $ProcessJarFile = [io.compression.zipfile]::Open($JarFile,'Update') } catch { # Error Handling } "Checking $JarFile for $FilenameToRemove" $totalFilesInJar = ($ProcessJarFile.Entries | Where FullName -Match $FilenameToRemove).Count if($totalFilesInJar -gt 0){ "Deleting unwanted file $FilenameToRemove from $JarFile" ($ProcessJarFile.Entries | Where FullName -Match $FilenameToRemove).Delete() $processedFiles++ } else { "File $FilenameToRemove not found inside $JarFile, this may have already been deleted." $skippedFiles++ } # Clean up / close the zip try { $ProcessJarFile.Dispose() } catch { # Error Handling } } "$processedFiles file(s) processed`n$skippedFiles file(s) skipped" Write-Host "Finished..." -fore green } if ( $verify ) { Write-Host "Running in dry-run mode. Will not process any files" -fore green } else { Write-Host "Running in fix mode. Will patch files that are found affected" -fore red } $dpa_path = Read-Host "Enter the DPA location " Write-Host "Running in : '$dpa_path' " -fore green if ($verify) { List-JndiLookup -JarFiles (Get-ChildItem -Exclude 'tmp' -Recurse -Path "$dpa_path" -Filter 'dpa*.jar' | ? { $_.FullName -inotmatch 'tmp' }).FullName -FilenameToRemove 'JndiLookup.class' } else { Remove-JndiLookup -JarFiles (Get-ChildItem -Exclude 'tmp' -Recurse -Path "$dpa_path" -Filter 'dpa*.jar' | ? { $_.FullName -inotmatch 'tmp' }).FullName -FilenameToRemove 'JndiLookup.class' }
Hvis du har spørgsmål eller har brug for hjælp til disse instruktioner, skal du kontakte Dells tekniske support.