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    SubjectRe: Strange errors in /var/log/messages
    On Mon, Jul 02, 2001 at 09:51:44PM +0200, kernel@ddx.a2000.nu wrote:
    > On Mon, 2 Jul 2001, Guest section DW wrote:
    >
    > > On Mon, Jul 02, 2001 at 05:16:23PM +0100, Alan Cox wrote:
    > >
    > > > > I'm running RedHat 7.0 with all official RH patches applied. The kernel I
    > > > > currently run fow a few days is 2.2.19-7.0.8
    > > > > I run the pre-compiled kernel of RH. Suddenly I the following messages:
    > > > >
    > > > > Jul 2 15:12:16 gateway SERVER[1240]: Dispatch_input: bad request line
    > > > > 'BBXXXXXXXXXXXXXXXXXX%.176u%3
    > > > > 00$nsecurity.%301$n%302$n%.192u%303$n\220\220\220\220\220\220\220\220\220\220\220\220\220\220\220\220\220\220\220\22
    > >
    > > > These are for an application. Not sure which or why
    > >
    > > See CERT Advisory CA-2000-22
    > > http://www.infowar.com/iwftp/cert/advisories/CA-2000-22.html
    > >
    > > "A popular replacement software package to the BSD lpd printing service
    > > called LPRng contains at least one software defect, known as a "format string
    > > vulnerability," which may allow remote users to execute arbitrary code on
    > > vulnerable systems."
    >
    > I just read the article. It seems somebody tried to exploid a bug in
    > LPRng. Unfortunately I didn't check the TCP/IP connections at the time of
    > attack (with netstat), so I couldn't tell who was connected to port 515.
    > The article suggest upgrading to 3.6.25. I'm currenlty running 3.7.4-23.
    > I assume I'm not vulnerable, but those 'errors' in the logfile really
    > scared the heck out of me! :) To be certain, I just blocked poort 515 for
    > outbound connections. :)
    >
    > Bye the way, sorry this message was off-topic, but I didn't know it was a
    > LPRng issue, not a kernel issue.

    A good idea is to block all ports, then open only those you know needs to
    be open. Paranoia is good.


    /David
    _ _
    // David Weinehall <tao@acc.umu.se> /> Northern lights wander \\
    // Project MCA Linux hacker // Dance across the winter sky //
    \> http://www.acc.umu.se/~tao/ </ Full colour fire </
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