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Security Advisory Updated ypserv packages fix a denial of service vulnerability

Advisory: RHSA-2003:173-07
Type: Security Advisory
Severity: N/A
Issued on: 2003-06-25
Last updated on: 2003-06-25
Affected Products: Red Hat Linux 7.1
Red Hat Linux 7.2
Red Hat Linux 7.3
Red Hat Linux 8.0
Red Hat Linux 9
CVEs (cve.mitre.org): CVE-2003-0251

Details

Updated ypserv packages fixing a denial of service vulnerability are now
available.

The ypserv package contains the Network Information Service (NIS) server.

A vulnerability has been discovered in the ypserv NIS server prior to
version 2.7. If a malicious client queries ypserv via TCP and subsequently
ignores the server's response, ypserv will block attempting to send the
reply. This results in ypserv failing to respond to other client requests.

Versions 2.7 and above of ypserv have been altered to fork a child for each
client request, thus preventing any one request from causing the server to
block.

Red Hat recommends that users of NIS upgrade to these packages, which
contain version 2.8.0 of ypserv and are therefore not vulnerable to this issue.


Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Updated packages

Red Hat Linux 7.1

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.72E/SRPMS/ypserv-2.8-0.72E.src.rpm
Missing file
    MD5: db17bee9fdb6d553dbb57850abff456a
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.72E/i386/ypserv-2.8-0.72E.i386.rpm
Missing file
    MD5: a51f5a9adf6ff4f255678e7407982a7e
 
Red Hat Linux 7.2

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.72E/SRPMS/ypserv-2.8-0.72E.src.rpm
Missing file
    MD5: db17bee9fdb6d553dbb57850abff456a
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.72E/i386/ypserv-2.8-0.72E.i386.rpm
Missing file
    MD5: a51f5a9adf6ff4f255678e7407982a7e
 
IA-64:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.72E/ia64/ypserv-2.8-0.72E.ia64.rpm
Missing file
    MD5: c300d319d7e883d5197b63f2e23fec88
 
Red Hat Linux 7.3

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.73E/SRPMS/ypserv-2.8-0.73E.src.rpm
Missing file
    MD5: c1977878cc0c0f90a9d55a4ae3b3bfe3
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.73E/i386/ypserv-2.8-0.73E.i386.rpm
Missing file
    MD5: 4af8d607cf8ba600288b5a5f164bf2f6
 
Red Hat Linux 8.0

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.80E/SRPMS/ypserv-2.8-0.80E.src.rpm
Missing file
    MD5: a606ee4aedc08cf7065e39d79b5e7474
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.80E/i386/ypserv-2.8-0.80E.i386.rpm
Missing file
    MD5: 9b72853f34de52966ff929218d1948bf
 
Red Hat Linux 9

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.9E/SRPMS/ypserv-2.8-0.9E.src.rpm
Missing file
    MD5: 158b6b1ea17e996f2909ed98e444d683
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/ypserv/2.8-0.9E/i386/ypserv-2.8-0.9E.i386.rpm
Missing file
    MD5: 86be6a349c1770893c6965611e29dc70
 

References


Keywords

DOS, NIS, ypserver


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