Slackware: nfs-utils denial of service vulnerability
Posted by LinuxSecurity.com Team   
Slackware This fixes an off-by-one buffer overflow in xlog.c which could be used by an attacker to produce a denial of NFS service, or to execute arbitrary code.

slackware-security]  nfs-utils off-by-one overflow fixed (SSA:2003-195-01)

New nfs-utils packages are available for Slackware 8.1, 9.0, and -current
to fix an off-by-one buffer overflow in xlog.c.  Thanks to Janusz
Niewiadomski for discovering and reporting this problem.

The CVE (Common Vulnerabilities and Exposures) Project has assigned the
identification number CAN-2003-0252 to this issue.

Here are the details from the Slackware 9.0 ChangeLog:
+--------------------------+
iMon Jul 14 14:15:34 PDT 2003
patches/packages/nfs-utils-1.0.4-i386-1.tgz:  Upgraded to nfs-utils-1.0.4.
  This fixes an off-by-one buffer overflow in xlog.c which could be used
  by an attacker to produce a denial of NFS service, or to execute
  arbitrary code.  All sites providing NFS services should upgrade to
  this new package immediately.
  (* Security fix *)
+--------------------------+


WHERE TO FIND THE NEW PACKAGES:
+-----------------------------+

Updated package for Slackware 8.1: 
ftp://ftp.slackware.com/pub/slackware/slackware-8.1/patches/packages/nfs-utils-1.0.4-i386-1.tgz

Updated package for Slackware 9.0: 
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/nfs-utils-1.0.4-i386-1.tgz

Updated package for Slackware -current: 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/nfs-utils-1.0.4-i486-1.tgz



MD5 SIGNATURES:
+-------------+

Slackware 8.1 package:
e6853189637bab81e7ba145ba3a401ae  nfs-utils-1.0.4-i386-1.tgz

Slackware 9.0 package:
92d45eeb49bade596c78c42b72af8807  nfs-utils-1.0.4-i386-1.tgz

Slackware -current package:
78ab9c34e3e01243626697d028a3ade2  nfs-utils-1.0.4-i486-1.tgz


INSTALLATION INSTRUCTIONS:
+------------------------+

First, if the NFS server is running, stop it:
. /etc/rc.d/rc.nfsd stop

Then upgrade using upgradepkg (as root):
upgradepkg nfs-utils-1.0.4-i386-1.tgz

Finally, restart NFS services:
. /etc/rc.d/rc.nfsd start



+-----+

Slackware Linux Security Team 
http://slackware.com/gpg-key
security@slackware.com