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.NET Framework Integer Overflow

.NET Framework Integer Overflow
Posted Jul 26, 2015
Authored by Yorick Koster, Securify B.V.

An integer overflow exists in the System.DirectoryServices.Protocols.Utility class of the .NET Framework. Triggering this issue results in an overflown integer that is used to allocate a buffer on the heap that is too small, resulting in memory corruption. Exploiting this issues appears to be difficult. Consequently, Microsoft has decided to not release a security bulletin.

tags | advisory, overflow, protocol
MD5 | bb0ce7a0311fab1c623adb567788d7b4

.NET Framework Integer Overflow

Change Mirror Download
------------------------------------------------------------------------
Integer overflow in .NET Framework
System.DirectoryServices.Protocols.Utility class
------------------------------------------------------------------------
Yorick Koster, May 2015

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Abstract
------------------------------------------------------------------------
An integer overflow exists in the
System.DirectoryServices.Protocols.Utility class of the .NET Framework.
Triggering this issue results in an overflown integer that is used to
allocate a buffer on the heap that is too small, resulting in memory
corruption. Exploiting this issues appears to be difficult.
Consequently, Microsoft has decided to not release a security bulletin.

------------------------------------------------------------------------
Affected versions
------------------------------------------------------------------------
This issue affects .NET Framework version 4.5 and 4.6. Other versions
are not affected as this issue can only be triggered using large arrays
(> 2GB).

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Fix
------------------------------------------------------------------------
There is currently no fix available for this issue. Microsoft will not
release a security bulletin, it may be fixed in future versions of the
.NET Framework.

[...] [we] are going to pursue this as a candidate for improvement in
future versions, [...] On x86, the feasibility of an attack is mitigated
by the maximum process memory and even on amd64, prevailing
configurations preclude this from being a feasible attack.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://www.securify.nl/advisory/SFY20150501/integer_overflow_in__net_framework_system_directoryservices_protocols_utility_class.html

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