11/19/2023 0 Comments Buffer overflow vulnerability![]() ![]() A screenshot I took states: Microsoft Advisory Microsoft pulled the patch for CVE-2020–0796 from March 2020 Patch Tuesday at the last minute and some information was leaked by Cisco Talos but then deleted from their post. Microsoft did not release a patch in March 2020 Patch Tuesday. Successful exploitation will result in remote code exection, with SYSTEM privileges. Windows 10 and Server use SMBv3.11 and the service runs as SYSTEM. SMBv3.11 has a buffer overflow vulnerability when compression is enabled (default value). Microsoft releases out of band patch: Summary Normal Data Execution Prevention (DEP) and ASLR also help to mitigate this attack.Immediately apply the skills and techniques learned in SANS courses, ranges, and summits Later versions of Windows such as Vista, Server 2008 and Windows 7 include: Removal of commonly targeted data structures, heap entry metadata randomization, expanded role of heap header cookie, randomized heap base address, function pointer encoding, termination of heap corruption and algorithm variation. ![]() These mitigations were safe unlinking and heap entry header cookies. Microsoft has included protections against heap resident buffer overflows since April 2003 in Windows Server 2003 and August 2004 in Windows XP with Service Pack 2. Also Linux has included support for NX-bit since 2004. In addition, Linux has included support for ASLR since 2005, although PaX introduced a better implementation years before. ![]() However, those protections against prior exploits were almost immediately shown to also be exploitable. Since version 2.3.6 the GNU libc includes protections that can detect heap overflows after the fact, for example by checking pointer consistency when calling unlink.
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