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2018-07 Security Bulletin: Junos OS: FreeBSD-SA-15:24.rpcbind : rpcbind(8) remote denial of service

  [JSA10860] Show Article Properties


Product Affected:
This issue affects Junos OS 12.1X46, 12.3, 12.3X48, 14.1X53, 15.1, 15.1X49, 15.1X53, 15.1X54, 16.1.
Problem:
A use-after-free vulnerability exists in rpcbind of Juniper Networks Junos OS allows an attacker to cause a Denial of Service against rpcbind.

Affected releases are Juniper Networks Junos OS:
12.1X46 versions prior to 12.1X46-D67 on SRX Series;
12.3R12 versions prior to 12.3R12-S10 on EX Series;
12.3X48 versions prior to 12.3X48-D55 on SRX Series;
14.1X53 versions prior to 14.1X53-D47 on EX2200/VC, EX3200, EX3300/VC, EX4200, EX4300, EX4550/VC, EX4600, EX6200, EX8200/VC (XRE), QFX3500, QFX3600, QFX5100;
14.1X53 versions prior to 14.1X53-D130 on QFabric System;
15.1 versions prior to 15.1F5-S5, 15.1F6-S1, 15.1F7, 15.1R4-S5, 15.1R5;
15.1X49 versions prior to 15.1X49-D110 on SRX Series;
15.1X53 versions prior to 15.1X53-D47, 15.1X53-D470 on NFX150, NFX250;
15.1X53 versions prior to 15.1X53-D233 on QFX5110, QFX5200;
15.1X53 versions prior to 15.1X53-D60 on QFX10000 Series;
15.1X53 versions prior to 15.1X53-D59 on EX2300, EX3400;
15.1X54 versions prior to 15.1X54-D67 on ACX Series;
16.1 versions prior to 16.1R2.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was discovered during an external security research.
This issue has been assigned CVE-2015-7236.

Solution:

The following software releases have been updated to resolve this specific issue: 12.1X46-D67, 12.3R12-S10, 12.3X48-D55, 14.1X53-D47, 14.1X53-D130*, 15.1F5-S5, 15.1F6-S1, 15.1F7, 15.1R4-S5, 15.1R5, 15.1X49-D110, 15.1X53-D47, 15.1X53-D59, 15.1X53-D60, 15.1X53-D233, 15.1X53-D470, 16.1R2, 16.2R1 and all subsequent releases.
*Pending Publication

This issue is being tracked as PR 1188676 which is visible on the Customer Support website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Workaround:
Disable rpcbind services where not needed.*
To further reduce the risk of exploitation customer may:
Enable loopback firewall filters on the device to drop rpcbind from untrusted networks. 
Filter out rpcbind traffic from reaching the device by using off-system services and devices.
There are no other viable workarounds for this issue.

*Customers are advised to proceed with caution when disabling rpcbind.  Customers intending to disable rpcbind should contact JTAC for supporting configuration guidance to determine if this workaround option is possible.  Disabling rpcbind without review may cause a disruption to service.
 

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
2018-07-11: Initial Publication.
Related Links:
CVSS Score:
5.9 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Medium
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."