Windows XP SP3 Can Corrupt TIFF Images

Microsoft has warned users of Windows XP Service Pack 3 of an issue that can lead to digital pictures becoming corrupted when handled with the default image viewers available as components of the operating system. According to the Redmond company the problem is limited to XP SP3. Microsoft has explained that when using Windows Picture or Fax Viewer to manage TIFF images, in the eventuality that a specific picture is rotated either clockwise or counterclockwise, that document will become corrupted.

“When a TIFF image is rotated in Windows Picture and Fax Viewer, the image is outputted. Then, the image is recompressed again,” Microsoft revealed. “This problem occurs because Windows Picture and Fax Viewer outputs a TIFF file in CCITT Group 3 format with 1D encoding. Therefore, when Windows Picture and Fax Viewer opens a TIFF file in CCITT Group 3 format with 2D encoding, the file is corrupted.”

CCITT stands for the International Telegraph and Telephone Consultative Committee. As far as TIFF images go, CCITT Group 3, CCITT Group 4 and Lempel-Ziv-Welch (LZW) act as the supported compression options. Essentially, users that have performed rotation actions with their TIFF images in XP SP3 with either Windows Picture or Fax Viewer have turned the files to what Microsoft referred to as “garbage image on the screen,” in relation to the corrupted file on the hard disk.

A hotfix is available for this specific issue, but affected customers will have to contact Microsoft in order to get it. “This problem only occurs to a TIFF document that is compressed in CCITT Group 3 format with 2D encoding. This problem does not occur if the TIFF document is set to read-only. When you use the Copy to feature in Windows Picture and Fax Viewer to save another copy of the TIFF document, the saved copy is also corrupted. However, the original file is not affected,” Microsoft said.

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The Sasser Worm

The Sasser WORM infects machines via network connections. It can attack entire networks of computers or one single computer connected to the Internet. The worm exploits a known windows vulnerability that is easily patched, however few systems seem to have this patch installed. It attacks Windows 2000 and Windows XP machines along with Windows NT and Windows Server 2003.

What are the Symptoms of the Sasser worm?

HOW 2 REMOVE

• Disconnect your computer from the local area network or Internet
• Terminate the running program
• Open the Windows Task Manager by either pressing CTRL+ALT+DEL, selecting the Processes tab or selecting Task Manager and then the process tab on WinNT/2000/XP machines.
• Locate one of the following programs (depending on variation), click on it and End Task or End Process

avserve.exe
avserve2.exe
skynetave.exe
any process running with the "_up.exe" suffix

• Close Task Manager

Remove the Registry entries

• Click on Start, Run, Regedit
• In the left panel go to

HKEY_LOCAL_MACHINE>Software>Microsoft>Windows>Current Version>Run

• In the right panel, right-click and delete the following entry

"avserve.exe"="%Windir%\avserve.exe"
"avserve2.exe"="%Windir%\avserve2.exe"
"skynetave.exe"= "%Windows%\skynetave.exe"

• Close the Registry Editor

• Delete the infected files (for Windows ME and XP remember to turn off System Restore before searching for and deleting these files to remove infected backed up files as well)

  • Click Start, point to Find or Search, and then click Files or Folders.
    
  • Make sure that "Look in" is set to (C:\WINDOWS).
    
  • In the "Named" or "Search for..." box, type, or copy and paste, the file names:
    
    avserve.exe
    avserve2.exe
    skynetave.exe
    C:\win2.log
    
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  • Empty the Recycle bin

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