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Category:   Application (Generic)  >   Quagga Vendors:   quagga.net
(Red Hat Issues Fix for Quagga) Quagga vty_write() Buffer Memory Allocation Flaw Lets Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1038213
SecurityTracker URL:  http://securitytracker.com/id/1038213
CVE Reference:   CVE-2017-5495   (Links to External Site)
Date:  Apr 8 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Quagga. A remote user can cause the target service to crash. Quagga is affected.

A remote user can connect to the telnet 'vty' and send data without a newline character to cause the target Quagga daemon to allocate excessive memory and crash.

Impact:   A remote user can cause the target service to crash.
Solution:   Red Hat has issued a fix for Quagga.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2017-0794.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2017-0794.html (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Jan 24 2017 Quagga vty_write() Buffer Memory Allocation Flaw Lets Remote Users Cause the Target Service to Crash



 Source Message Contents

Date:  Tue, 21 Mar 2017 09:46:20 +0000
Subject:  [RHSA-2017:0794-01] Moderate: quagga security and bug fix update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: quagga security and bug fix update
Advisory ID:       RHSA-2017:0794-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0794.html
Issue date:        2017-03-21
CVE Names:         CVE-2013-2236 CVE-2016-1245 CVE-2016-2342 
                   CVE-2016-4049 CVE-2017-5495 
=====================================================================

1. Summary:

An update for quagga is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

The quagga packages contain Quagga, the free network-routing software suite
that manages TCP/IP based protocols. Quagga supports the BGP4, BGP4+,
OSPFv2, OSPFv3, RIPv1, RIPv2, and RIPng protocols, and is intended to be
used as a Route Server and Route Reflector.

Security Fix(es):

* A stack-based buffer overflow flaw was found in the way Quagga handled
IPv6 router advertisement messages. A remote attacker could use this flaw
to crash the zebra daemon resulting in denial of service. (CVE-2016-1245)

* A stack-based buffer overflow flaw was found in the way the Quagga BGP
routing daemon (bgpd) handled Labeled-VPN SAFI routes data. A remote
attacker could use this flaw to crash the bgpd daemon resulting in denial
of service. (CVE-2016-2342)

* A denial of service flaw was found in the Quagga BGP routing daemon
(bgpd). Under certain circumstances, a remote attacker could send a crafted
packet to crash the bgpd daemon resulting in denial of service.
(CVE-2016-4049)

* A denial of service flaw affecting various daemons in Quagga was found. A
remote attacker could use this flaw to cause the various Quagga daemons,
which expose their telnet interface, to crash. (CVE-2017-5495)

* A stack-based buffer overflow flaw was found in the way the Quagga OSPFD
daemon handled LSA (link-state advertisement) packets. A remote attacker
could use this flaw to crash the ospfd daemon resulting in denial of
service. (CVE-2013-2236)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9
Technical Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing the updated packages, the bgpd daemon must be restarted
for the update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

674862 - Add missing man pages in quagga package
770731 - Interface prefix advertisement declaration prevents ospf6d from starting
839620 - /etc/sysconfig/quagga defines QCONFDIR, init scripts do not use it
842308 - quagga daemon pidfiles remain after daemons are stopped
862826 - Correct spec to add watchquagga
981124 - CVE-2013-2236 Quagga: OSPFD Potential remote code exec (stack based buffer overflow)
1316571 - CVE-2016-2342 quagga: VPNv4 NLRI parser memcpys to stack on unchecked length
1331372 - CVE-2016-4049 quagga: denial of service vulnerability in BGP routing daemon
1386109 - CVE-2016-1245 quagga: Buffer Overflow in IPv6 RA handling
1416013 - CVE-2017-5495 quagga: Telnet interface input buffer allocates unbounded amounts of memory

6. Package List:

Red Hat Enterprise Linux Server (v. 6):

Source:
quagga-0.99.15-14.el6.src.rpm

i386:
quagga-0.99.15-14.el6.i686.rpm
quagga-debuginfo-0.99.15-14.el6.i686.rpm

ppc64:
quagga-0.99.15-14.el6.ppc64.rpm
quagga-debuginfo-0.99.15-14.el6.ppc64.rpm

s390x:
quagga-0.99.15-14.el6.s390x.rpm
quagga-debuginfo-0.99.15-14.el6.s390x.rpm

x86_64:
quagga-0.99.15-14.el6.x86_64.rpm
quagga-debuginfo-0.99.15-14.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
quagga-contrib-0.99.15-14.el6.i686.rpm
quagga-debuginfo-0.99.15-14.el6.i686.rpm
quagga-devel-0.99.15-14.el6.i686.rpm

ppc64:
quagga-contrib-0.99.15-14.el6.ppc64.rpm
quagga-debuginfo-0.99.15-14.el6.ppc.rpm
quagga-debuginfo-0.99.15-14.el6.ppc64.rpm
quagga-devel-0.99.15-14.el6.ppc.rpm
quagga-devel-0.99.15-14.el6.ppc64.rpm

s390x:
quagga-contrib-0.99.15-14.el6.s390x.rpm
quagga-debuginfo-0.99.15-14.el6.s390.rpm
quagga-debuginfo-0.99.15-14.el6.s390x.rpm
quagga-devel-0.99.15-14.el6.s390.rpm
quagga-devel-0.99.15-14.el6.s390x.rpm

x86_64:
quagga-contrib-0.99.15-14.el6.x86_64.rpm
quagga-debuginfo-0.99.15-14.el6.i686.rpm
quagga-debuginfo-0.99.15-14.el6.x86_64.rpm
quagga-devel-0.99.15-14.el6.i686.rpm
quagga-devel-0.99.15-14.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
quagga-0.99.15-14.el6.src.rpm

i386:
quagga-0.99.15-14.el6.i686.rpm
quagga-debuginfo-0.99.15-14.el6.i686.rpm

x86_64:
quagga-0.99.15-14.el6.x86_64.rpm
quagga-debuginfo-0.99.15-14.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
quagga-contrib-0.99.15-14.el6.i686.rpm
quagga-debuginfo-0.99.15-14.el6.i686.rpm
quagga-devel-0.99.15-14.el6.i686.rpm

x86_64:
quagga-contrib-0.99.15-14.el6.x86_64.rpm
quagga-debuginfo-0.99.15-14.el6.i686.rpm
quagga-debuginfo-0.99.15-14.el6.x86_64.rpm
quagga-devel-0.99.15-14.el6.i686.rpm
quagga-devel-0.99.15-14.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2013-2236
https://access.redhat.com/security/cve/CVE-2016-1245
https://access.redhat.com/security/cve/CVE-2016-2342
https://access.redhat.com/security/cve/CVE-2016-4049
https://access.redhat.com/security/cve/CVE-2017-5495
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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