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MS06-049 Causing Silent Data Corruption

Posted by ryuzaki0 on from the oh-who-wants-encryption-anyway dept.

Uncle Mike writes "It looks like there is a problem with the recently released MS06-049 / KB920958 patch. If you have compression activated on any folder, then the compressed data is at risk from corruption. New files that are close to a multiple of 4K in size will have their last 4,000 bytes or so overwritten with 0xDF. Although this problem has been reported to Microsoft, as yet there appears to have been no official announcement. "

2 of 205 comments (clear)

  1. How to avoid by neonprimetime · · Score: 4, Informative

    assuming you're using Windows

    It has been confirmed that either turning off the compression attribute (disk space permitting) OR uninstalling KB920958 will prevent further loss of data.

  2. More background please... by Chris+Pimlott · · Score: 5, Informative

    The summary blurb is rather cryptic. MS06-049 is a patch to... what? Just Windows 2000 or XP too? And this was a patch for some vulnerability, assumedly? Which?

    After a bit of research, here's what should have been included: MS06-049 was an elevation of privledge issue discovered in the kernel of Windows 2000 SP4 only. The patch for the issue, KB920958, appears to have a bug resulting in corruption of compressed folder.

    The title is misleading as well. MS06-649 is the issue and KB920958 is the patch; the patch is what's causing the corruption, not the original issue.