https://bz.apache.org/bugzilla/show_bug.cgi?id=66590
Bug ID: 66590
Summary: Number of blocks used by the property table missing
from the file header
Product: POI
Version: 5.2.3-FINAL
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: POIFS
Assignee: dev@poi.apache.org
Reporter: ebo...@apache.org
Target Milestone: ---
I'm using POIFS to modify MSI files (for Authenticode signing with Jsign) and
for some files the addition of an entry corrupts the file. I've tracked down
the issue to the number of blocks used by the property table in the file header
(at offset 0x28) which is not handled by POIFS. When the header is parsed the
value of this field is ignored, and when the header is saved the actual number
of blocks is never written.
This is problematic because msiexec.exe relies on this field to parse the
content of the MSI files, it won't process the full stream of the property
table even if its chain in the allocation table spans over more blocks. When
the entry added by the signing process is located on a new block of the
property table, the binary tree holding the properties is re-balanced and a
part is grafted to the new entry. Since the number of blocks isn't updated in
the header this part of the tree becomes unreachable and the file is corrupted.
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