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2018-10 Security Bulletin: Junos OS: Denial of Service vulnerability in MS-PIC, MS-MIC, MS-MPC, MS-DPC and SRX flow daemon (flowd) related to SIP ALG (CVE-2018-0051)

  [JSA10885] Show Article Properties


Product Affected:
This issue affects Junos OS 12.1X46, 12.3X48, 15.1, 15.1F6, 15.1X49, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4.
Problem:
A Denial of Service vulnerability in the SIP application layer gateway (ALG) component of Junos OS based platforms allows an attacker to crash MS-PIC, MS-MIC, MS-MPC, MS-DPC or SRX flow daemon (flowd) process.

This issue affects Junos OS devices with NAT or stateful firewall configuration in combination with the SIP ALG enabled.

SIP ALG is enabled by default on SRX Series devices except for SRX-HE devices. SRX-HE devices have SIP ALG disabled by default.

The status of ALGs in SRX device can be obtained by executing the command:
show security alg status

Affected releases are Juniper Networks Junos OS:
  • 12.1X46 versions prior to 12.1X46-D77;
  • 12.3X48 versions prior to 12.3X48-D70;
  • 15.1X49 versions prior to 15.1X49-D140;
  • 15.1 versions prior to 15.1R4-S9, 15.1R7-S1;
  • 15.1F6;
  • 16.1 versions prior to 16.1R4-S9, 16.1R6-S1, 16.1R7;
  • 16.2 versions prior to 16.2R2-S7, 16.2R3;
  • 17.1 versions prior to 17.1R2-S7, 17.1R3;
  • 17.2 versions prior to 17.2R1-S6, 17.2R2-S4, 17.2R3;
  • 17.3 versions prior to 17.3R1-S5, 17.3R2-S2, 17.3R3;
  • 17.4 versions prior to 17.4R2.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

No other Juniper Networks products or platforms are affected by this issue.

This issue has been assigned CVE-2018-0051.
 
Solution:

The following software releases have been updated to resolve these specific issues: 12.1X46-D77, 12.3X48-D70, 12.3X48-D75, 14.1X53-D47, 15.1R4-S9, 15.1R7-S1, 15.1X49-D140, 15.1X53-D471, 15.1X53-D490, 15.1X53-D59, 15.1X53-D67, 16.1R4-S9, 16.1R6-S1, 16.1R7, 16.2R2-S7, 16.2R3, 17.1R2-S7, 17.1R3, 17.2R1-S6, 17.2R2-S4, 17.2R3, 17.3R1-S5, 17.3R2-S2, 17.3R3, 17.4R2, 18.1R1, 18.1X75-D10, 18.2R1, 18.2X75-D5, and all subsequent releases.

This fix has also been proactively committed into other releases that might not support SIP ALG configuration.

This issue is being tracked as PR 1326394 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 the use of the SIP ALG feature if it is not needed.
 

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
‚Äč2018-10-10: Initial publication

Related Links:
CVSS Score:
7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Risk Level:
High