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2019-10 Security Bulletin: SRX5000 Series: Denial of Service vulnerability in SSL-Proxy feature. (CVE-2019-0051)

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Article ID: JSA10973 SECURITY_ADVISORIES Last Updated: 09 Oct 2019Version: 4.0
Product Affected:
This issue affects Junos OS 12.3X48, 15.1X49, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1. Affected platforms: SRX5000 Series.
Problem:

SSL-Proxy feature on SRX devices fails to handle a hardware resource limitation which can be exploited by remote SSL/TLS servers to crash the flowd daemon.

Repeated crashes of the flowd daemon can result in an extended denial of service condition. For this issue to occur, clients protected by the SRX device must initiate a connection to the malicious server.

This issue affects:

Juniper Networks Junos OS on SRX5000 Series:

12.3X48 versions prior to 12.3X48-D85;

15.1X49 versions prior to 15.1X49-D180;

17.3 versions prior to 17.3R3-S7;

17.4 versions prior to 17.4R2-S6, 17.4R3;

18.1 versions prior to 18.1R3-S8;

18.2 versions prior to 18.2R3;

18.3 versions prior to 18.3R2;

18.4 versions prior to 18.4R2;

19.1 versions prior to 19.1R2.

SSL forward proxy feature must be configured for this issue to occur. For e.g.,

set services ssl proxy

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-2019-0051.

Solution:

The following software releases have been updated to resolve this specific issue: 12.3X48-D85, 15.1X49-D180, 17.3R3-S7 (pending), 17.4R2-S6, 17.4R3, 18.1R3-S8 (pending), 18.2R3, 18.3R2, 18.4R2, 19.1R2, 19.2R1, and all subsequent releases.

This issue is being tracked as PR 1411110 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:
There are no viable workarounds for this issue.
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
2019-10-09: Initial Publication.
CVSS Score:
6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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."
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