All three vulnerabilities discussed in this bulletin involve the inclusion of
the Sun RPC library in Microsoft’s Services for UNIX (SFU) 3.0 on the Interix SDK.
Developers who created applications or utilities using the Sun RPC library from
the Interix SDK need to evaluate three vulnerabilities.
Zipped files (files having a
.zip
extension) provide a means to store information in a way that uses less space
on a hard disk. This is accomplished by compressing the files that are put into
in the zipped file. On Windows 98 with Plus! Pack, Windows Me and Windows XP, the
Compressed Folders feature allows zipped files to be treated as folders. The Compressed
Folders feature can be used to create, add files to, and extract files from zipped
files.
Two vulnerabilities exist in the Compressed Folders function:
- An unchecked buffer exists in the programs that handles the
decompressing of files from a zipped file. A security vulnerability results because
attempts to open a file with a specially malformed filename contained in a zipped
file could possibly result in Windows Explorer failing, or in code of the attacker’s
choice being run.
- The decompression function could place a file in a directory
that was not the same as, or a child of, the target directory specified by the
user as where the decompressed zip files should be placed. This could allow an
attacker to put a file in a known location on the users system, such as placing
a program in a startup directory
Patch availability
Download locations for this patch
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