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Re: Overflow in xlock

daemon@ATHENA.MIT.EDU (Bollinger)
Sun Apr 27 13:48:01 1997

Date: 	Sun, 27 Apr 1997 09:30:53 -0500
Reply-To: Bollinger <troy@AUSTIN.IBM.COM>
From: Bollinger <troy@AUSTIN.IBM.COM>
To: BUGTRAQ@NETSPACE.ORG
In-Reply-To:  <Pine.LNX.3.91.970426160718.1940A-100000@warrior.0wned.org> from
              "George Staikos" at Apr 26, 97 04:16:05 pm

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George Staikos wrote:
>
> There appears to be an exploitable buffer overflow in xlock, the X based
> screensaver/locker.  Xlock is installed suid root on machines with
> shadowed passwords.  I have verified this on xlock versions on AIX 4.x

There's a temporary fix for the AIX v4 xlock available for anonymous ftp
from testcase.software.ibm.com:/aix/fromibm/xlock.overflow_fix.aix4.Z.

Checksums:

sum              01445    73 xlock.overflow_fix.aix4
sum -i           41749    73 xlock.overflow_fix.aix4
sum -o           14725    73 xlock.overflow_fix.aix4

MD5 (xlock.overflow_fix.aix4) = e5e679a73b5a28ef471751bfee67d00c


Official APARs are in progress and will be available shortly.

If there are any questions regarding this fix or any other AIX security
bug, please contact security-alert@austin.ibm.com.  Sensitive
information can be encrypted using the AIX Security PGP key.  To
retrieve this key send email with a subject of "get key" to
security-alert@austin.ibm.com.

- --
+----------------  I do not speak for IBM!  ------------------+
|Troy Bollinger             |      email:  troy@austin.ibm.com|
|AIX Security Development   | Sometimes the old ways are best.|
+-------------------------------------------------------------+

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