Multiple issues have been identified in LibreOffice / OpenOffice that
allow to execute arbitrary code via specially crafted office files.
Elements outside expected parent elements
-----------------------------------------
Initially, the aSequence attribute of a ManifestImport instance has
no memory allocated for PropertyValue elements.
ManifestImport::startElement() (re)allocates memory when
a "manifest:file-entry" XML element is encountered in the manifest
file. The property values are, for example, accessed when
a "manifest:encryption-data" XML element is found. If such
elements are located outside an expected parent element
"manifest:file-entry", ManifestImport::startElement() accesses
aSequence out-of-bounds.
Writes beyond fixed size buffer
-------------------------------
ManifestImport::startElement() allocates memory for 12 (=
PKG_SIZE_ENCR_MNFST) PropertValue elements. If
a "manifest:file-entry" XML element has child elements that cause
startElement() to access more than 12 PropertValues, startElement()
accesses aSequence out-of-bounds.
Base64Codec::decodeBase64()
---------------------------
ManifestImport::startElement() calls Base64Codec::decodeBase64() to
decode the XML attributes for checksums, initialization vectors, and
salt values. Base64Codec::decodeBase64() implicitly assumes that the
source buffer sBuffer contains a number of characters divisible by 4.
If this is not the case, the called method FourByteToThreeByte()
writes up to 3 bytes past a buffer allocated on the heap.
The issue has been fixed in LibreOffice 3.5.5.
An update to Apache OpenOffice is pending.
http://www.libreoffice.org/advisories/CVE-2012-2665/
https://bugzilla.redhat.com/show_bug.cgi?id=826077
When further information becomes available, this advisory will be
updated. The most recent version of this advisory is available at:
http://www.pre-cert.de/advisories/PRE-SA-2012-05.txt
PRE-CERT can be reached under [email protected]. For PGP key
information, refer to http://www.pre-cert.de/.