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when writing their TCP/IP stack Therefore, by probing for these differences, we can begin to make an educated guess as to the exact operating system in use For maximum reliability, stack fingerprinting generally requires at least one listening port Nmap will make an educated guess about the operating system in use if no ports are open However, the accuracy of such a guess will be fairly low The definitive paper on the subject was written by Fyodor, first published in Phrack Magazine, and can be found at http://www insecureorg/nmap/nmap-fingerprinting-articlehtml Let s examine the types of probes that can be sent that help to distinguish one operating system from another: FIN probe A FIN packet is sent to an open port As mentioned previously, RFC 793 states that the correct behavior is not to respond However, many stack implementations (such as Windows NT/200X/Vista) will respond with a FIN/ ACK Bogus ag probe An unde ned TCP ag is set in the TCP header of a SYN packet Some operating systems, such as Linux, will respond with the ag set in their response packet Initial Sequence Number (ISN) sampling The basic premise is to nd a pattern in the initial sequence chosen by the TCP implementation when responding to a connection request Don t fragment bit monitoring Some operating systems will set the Don t fragment bit to enhance performance This bit can be monitored to determine what types of operating systems exhibit this behavior TCP initial window size Initial window size on returned packets is tracked For some stack implementations, this size is unique and can greatly add to the accuracy of the ngerprint mechanism ACK value IP stacks differ in the sequence value they use for the ACK eld, so some implementations will send back the sequence number you sent, and others will send back a sequence number + 1 ICMP error message quenching Operating systems may follow RFC 1812 (http://wwwietforg/rfc/rfc1812txt) and limit the rate at which error messages are sent By sending UDP packets to some random high-numbered port, you can count the number of unreachable messages received within a given amount of time This is also helpful in determining if UDP ports are open ICMP message quoting Operating systems differ in the amount of information that is quoted when ICMP errors are encountered By examining the quoted message, you may be able to make some assumptions about the target operating system ICMP error message echoing integrity Some stack implementations may alter the IP headers when sending back ICMP error messages By examining the types of alterations that are made to the headers, you may be able to make some assumptions about the target operating system.

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with some built-in intelligence for example, a callout that continues to point to the same spot in the document even when you move it

Dynamic linkers should ignore the LD_PRELOAD environment variable for SUID root binaries Purists may argue that shared libraries should be well written and safe for them to be specified in LD_PRELOAD In reality, programming flaws in these libraries expose the system to attack when an SUID binary is executed Moreover, shared libraries (for example, /usr/lib and /lib) should be protected with the same level of security as the most sensitive files If attackers can gain access to /usr/lib or /lib, the system is toast

Charts are charts and graphs inserted using Excel s charting features SmartArt items are diagrams, such as organization charts and hierarchy diagrams, with

It is no secret that UNIX is a complex and highly robust operating system With this complexity, UNIX and other advanced operating systems will inevitably have some sort of programming flaws For UNIX systems, the most devastating security flaws are

To add a shape to a document, follow these steps: 1 Choose Insert | Illustrations | Shapes Word displays the Shapes panel, which provides a wide variety of shapes, from lines and basic shapes to owchart shapes and callouts 2 Click the shape you want Word changes the mouse pointer to a crosshair If the document is in Draft view or Outline view, Word switches to Print Layout view so that you can see how you re positioning the shape 3 Click (and hold down the mouse button) in the document to position one corner of the shape It doesn t matter which corner you position, so position whichever corner is most convenient 4 Drag to the size you want the shape to be, as shown here When you release the mouse button, Word restores the mouse pointer You can also center the shape, constrain it, or create multiple shapes of the same type:

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you click and start dragging, instead of having one corner of the shape (or the rectangular frame that surrounds a nonrectangular shape) appear there, hold down CTRL as you click and drag

associated with the kernel itself The UNIX kernel is the core component of the operating system that enforces the overall security model of the system This model includes honoring file and directory permissions, the escalation and relinquishment of privileges from SUID files, how the system reacts to signals, and so on If a security flaw occurs in the kernel itself, the security of the entire system is in grave danger The year 2004 was full of kernel vulnerabilities for the Linux operating system over 20! Some of these vulnerabilities were simply denial of service attacks, but others such as buffer overflows, race conditions that led to privilege escalation, and integer overflows were exposed as well An example of a kernel flaw that affects millions of systems was discovered in January 2005 by Paul Starzetz and is related to almost all Linux 22x, 24x, and 26x kernels developed as of that date The vulnerability is related to the loader layer the kernel uses to execute different binary formats such as ELF and aout The kernel function sys_uselib() is called to load a library Analysis of the sys_uselib() function reveals an incorrect handling of the library s brk segment: