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Sasser was created on April 30, 2004. [2] This worm was named Sasser because it spreads by exploiting a buffer overflow in the component known as LSASS (Local Security Authority Subsystem Service) on the affected operating systems.
Visualization of a software buffer overflow. Data is written into A, but is too large to fit within A, so it overflows into B.. In programming and information security, a buffer overflow or buffer overrun is an anomaly whereby a program writes data to a buffer beyond the buffer's allocated memory, overwriting adjacent memory locations.
The worm showed a vulnerability in software distributed with IIS, described in Microsoft Security Bulletin MS01-033 (CVE-2001-0500), [5] for which a patch had become available a month earlier. The worm spread itself using a common type of vulnerability known as a buffer overflow. It did this by using a long string of the repeated letter 'N' to ...
The program exploited a buffer overflow bug in Microsoft's SQL Server and Desktop Engine database products. Although the MS02-039 (CVE-2002-0649) [2] patch had been released six months earlier, many organizations had not yet applied it. The most infected regions were Europe, North America, and Asia (including East Asia and India). [3]
Stack buffer overflow is a type of the more general programming malfunction known as buffer overflow (or buffer overrun). [1] Overfilling a buffer on the stack is more likely to derail program execution than overfilling a buffer on the heap because the stack contains the return addresses for all active function calls.
Welchia was successful in deleting Blaster, but Microsoft claimed that it was not always successful in applying their security patch. [1] This worm infected systems by exploiting vulnerabilities in Microsoft Windows system code (TFTPD.EXE and TCP on ports 666–765, and a buffer overflow of the RPC on port 135). Its method of infection is to ...
Canaries or canary words or stack cookies are known values that are placed between a buffer and control data on the stack to monitor buffer overflows. When the buffer overflows, the first data to be corrupted will usually be the canary, and a failed verification of the canary data will therefore alert of an overflow, which can then be handled, for example, by invalidating the corrupted data.
The damage to Microsoft was minimal as the site targeted was windowsupdate.com, rather than windowsupdate.microsoft.com, to which the former was redirected. Microsoft temporarily shut down the targeted site to minimize potential effects from the worm. [citation needed] The worm's executable, MSBlast.exe, [10] contains two messages. The first reads: