CVE-2017-10618

Junos: RPD core due to BGP UPDATE with malformed optional transitive attributes

Description

When the 'bgp-error-tolerance' feature â" designed to help mitigate remote session resets from malformed path attributes â" is enabled, a BGP UPDATE containing a specifically crafted set of transitive attributes can cause the RPD routing process to crash and restart. Devices with BGP enabled that do not have 'bgp-error-tolerance' configured are not vulnerable to this issue. Affected releases are Juniper Networks Junos OS 13.3 prior to 13.3R10-S2; 14.1 prior to 14.1R8-S4, 14.1R9; 14.1X50 prior to 14.1X50-D185; 14.1X53 prior to 14.1X53-D45, 14.1X53-D50; 14.2 prior to 14.2R7-S7, 14.2R8; 15.1 prior to 15.1F5-S8, 15.1F6-S7, 15.1R5-S6, 15.1R6-S2, 15.1R7; 15.1X49 prior to 15.1X49-D100; 15.1X53 prior to 15.1X53-D64, 15.1X53-D70; 16.1 prior to 16.1R3-S4, 16.1R4-S3, 16.1R5; 16.2 prior to 16.2R1-S5, 16.2R2; 17.1 prior to 17.1R1-S3, 17.1R2; 17.2 prior to 17.2R1-S2, 17.2R2; 17.2X75 prior to 17.2X75-D50. No other Juniper Networks products or platforms are affected by this issue.

Remediation

Workaround:

If 'bgp-error-tolerance' is enabled, disabling this option under 'protocols bgp' will mitigate this issue. Note that when the error handling feature is off, the router is vulnerable to session resets from malformed path attributes. However, this is RFC 4271 compliant behavior.

5.9

CVSS

Severity: Medium

CVSS 3.0 •

CVSS 2.0 •

EPSS 0.29%

Vendor Advisory juniper.net Vendor Advisory juniper.net Vendor Advisory juniper.net

Affected: Juniper Networks Junos OS

References

Link	Tags
https://www.juniper.net/documentation/en_US/junos/topics/concept/bgp-error-handling-overview.html	vendor advisory
https://kb.juniper.net/JSA10820	mitigation vendor advisory
https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/bgp-error-tolerance.html	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-10618?: CVE-2017-10618 has been scored as a medium severity vulnerability.
How to fix CVE-2017-10618?: As a workaround for remediating CVE-2017-10618: If 'bgp-error-tolerance' is enabled, disabling this option under 'protocols bgp' will mitigate this issue. Note that when the error handling feature is off, the router is vulnerable to session resets from malformed path attributes. However, this is RFC 4271 compliant behavior.
Is CVE-2017-10618 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2017-10618 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-10618?: CVE-2017-10618 affects Juniper Networks Junos OS.