.NET Framework Integer Overflow

Credit: Yorick Koster
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-189

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