2020-10 Security Bulletin: Junos OS: SRX Series: High CPU load due to processing for HTTP traffic when Application Identification is enabled. (CVE-2020-1684)

Product Affected:

This issue affects Junos OS 12.3X48, 15.1X49, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4. Affected platforms: SRX Series.

Problem:

On Juniper Networks SRX Series configured with application identification inspection enabled, receipt of specific HTTP traffic can cause high CPU load utilization, which could lead to traffic interruption.

Application identification is enabled by default and is automatically turned on when Intrusion Detection and Prevention (IDP), AppFW, AppQoS, or AppTrack is configured. Thus, this issue might occur when IDP, AppFW, AppQoS, or AppTrack is configured.

This issue affects Juniper Networks Junos OS on SRX Series:

12.3X48 versions prior to 12.3X48-D105;
15.1X49 versions prior to 15.1X49-D221, 15.1X49-D230;
17.4 versions prior to 17.4R3-S3;
18.1 versions prior to 18.1R3-S11;
18.2 versions prior to 18.2R3-S3;
18.3 versions prior to 18.3R2-S4, 18.3R3-S2;
18.4 versions prior to 18.4R2-S5, 18.4R3-S1;
19.1 versions prior to 19.1R2-S2, 19.1R3;
19.2 versions prior to 19.2R1-S5, 19.2R2;
19.3 versions prior to 19.3R3;
19.4 versions prior to 19.4R2.

Application identification is enabled by default. Administrator can disable application identification with the CLI.

To disable application identification:

user@host# set services application-identification no-application-identification
user@host# commit

Or (depending on the version)

user@host# set system processes application-identification disable
user@host# commit

To check whether is enabled, administrator can use the following command:

user@host> show services application-identification application summary

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

This issue was seen during production usage.

This issue has been assigned CVE-2020-1684.

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 12.3X48-D105, 15.1X49-D221, 15.1X49-D230, 17.4R3-S3, 18.1R3-S11, 18.2R3-S3, 18.3R2-S4, 18.3R3-S2, 18.4R2-S5, 18.4R3-S1, 19.1R2-S2, 19.1R3, 19.2R1-S5, 19.2R2, 19.3R3, 19.4R2, 20.1R1,and all subsequent releases.

This issue is being tracked as 1473151.

Workaround:

There are no viable workarounds for this issue.

Implementation:

Software releases or updates are available for download at https://www.juniper.net/support/downloads/.

Modification History:

2020-10-14: Initial Publication.

CVSS Score:

7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Severity Level:

High

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."

Knowledge Base