Junos LDP DoS Vulnerability

Published: 2017-04-13 06:24:49
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:S/C:N/I:N/A:C

Detection Type:
Linux Distribution Package

Solution Type:
Vendor Patch

Summary:
Junos OS is prone to denial of service vulnerability when receiving crafted LDP packets.

Detection Method:
Checks if a vulnerable OS build is present on the target host.

Technical Details:
A specific LDP packet destined to the RE (Routing Engine) will consume a small amount of the memory allocated for the rpd process. Over time, repeatedly receiving this type of LDP packet(s) will cause the memory to exhaust and the rpd process to crash and restart. It is not possible to free up the memory that has been consumed without restarting the rpd process. This issue affects Junos OS based devices with either IPv4 or IPv6 LDP enabled via the [protocols ldp] configuration. The interface on which the packet arrives needs to have LDP enabled.

Impact:
An attacker may cause a denial of service condition.

Affected Versions:
Junos OS 13.3, 14.1, 14.2, 15.1 and 16.1

Recommendations:
New builds of Junos OS software are available from Juniper. As a workaround use access lists or firewall filters to limit access to the device via LDP only from trusted networks or hosts, or enable MD5 authentication on all authorized LDP sessions.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2017-2312

References:

http://kb.juniper.net/JSA10777

Severity
Medium
CVSS Score
6.8
Published
2017-04-13
Modified
2018-10-26
Category
JunOS Local Security Checks

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