National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-5495 Detail

Current Description

All versions of Quagga, 0.93 through 1.1.0, are vulnerable to an unbounded memory allocation in the telnet 'vty' CLI, leading to a Denial-of-Service of Quagga daemons, or even the entire host. When Quagga daemons are configured with their telnet CLI enabled, anyone who can connect to the TCP ports can trigger this vulnerability, prior to authentication. Most distributions restrict the Quagga telnet interface to local access only by default. The Quagga telnet interface 'vty' input buffer grows automatically, without bound, so long as a newline is not entered. This allows an attacker to cause the Quagga daemon to allocate unbounded memory by sending very long strings without a newline. Eventually the daemon is terminated by the system, or the system itself runs out of memory. This is fixed in Quagga 1.1.1 and Free Range Routing (FRR) Protocol Suite 2017-01-10.

Source:  MITRE
Description Last Modified:  01/24/2017
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 3.9


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 7.8 HIGH
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:C) (V2 legend)
Impact Subscore: 6.9
Exploitability Subscore: 10.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://rhn.redhat.com/errata/RHSA-2017-0794.html
http://savannah.nongnu.org/forum/forum.php?forum_id=8783 Release Notes Vendor Advisory
http://www.securityfocus.com/bid/95745
http://www.securitytracker.com/id/1037688
https://github.com/freerangerouting/frr/pull/63 Patch Vendor Advisory
https://lists.quagga.net/pipermail/quagga-dev/2017-January/016586.html

Technical Details

Vulnerability Type (View All)

Vulnerable software and versions Switch to CPE 2.3

Configuration 1
OR
cpe:/a:quagga:quagga    versions up to (including) 1.1.0

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

4 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-5495
NVD Published Date:
01/24/2017
NVD Last Modified:
01/04/2018