Quagga bgpd with BGP peers enabled for VPNv4 contains a buffer overflow vulnerability

Overview

Quagga, version 0.99.24.1 and earlier, contains a buffer overflow vulnerability in bgpd with BGP peers enabled for VPNv4 that may leveraged to gain code execution.

Description

CWE-121: Stack-based Buffer Overflow - CVE-2016-2342

Quagga is a software routing suite that implements numerous routing protocols for Unix-based platforms. A memcpy function in the VPNv4 NLRI parser of bgp_mplsvpn.c does not properly check the upper-bound length of received Labeled-VPN SAFI routes data, which may allow for arbitrary code execution on the stack. Note that hosts are only vulnerable if bgpd is running with BGP peers enabled for VPNv4, which is not a default configuration. For more details, refer to the Quagga changelog and commit notes.

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Impact

A malicious BGP peer may execute arbitrary code in particularly configured remote bgpd hosts.

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Solution

Apply an update

Quagga has released version 1.0.20160309 which addresses this issue.

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Vendor Information

270232

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Quagga Affected

Notified: November 24, 2015 Updated: March 10, 2016

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	7.6	AV:N/AC:H/Au:N/C:C/I:C/A:C
Temporal	6	E:POC/RL:OF/RC:C
Environmental	1.5	CDP:ND/TD:L/CR:ND/IR:ND/AR:ND

References

• <http://www.quagga.net/&gt;
• <http://nongnu.askapache.com//quagga/quagga-1.0.20160309.changelog.txt&gt;
• <http://git.savannah.gnu.org/cgit/quagga.git/commit/?id=a3bc7e9400b214a0f078fdb19596ba54214a1442&gt;

Acknowledgements

Thanks to Kostya Kortchinsky for reporting this vulnerability.

This document was written by Joel Land.

Other Information

CVE IDs:	CVE-2016-2342
Date Public:	2016-03-10 Date First Published: