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2019-10 Security Bulletin: Junos OS: SRX Series: An attacker may cause flowd to crash by sending certain valid SIP traffic to a device with SIP ALG enabled. (CVE-2019-0055)

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Article ID: JSA10953 SECURITY_ADVISORIES Last Updated: 09 Oct 2019Version: 4.0
Product Affected:
This issue affects Junos OS 12.3X48, 15.1X49, 17.3, 17.4. Affected platforms: SRX Series.
Problem:
A vulnerability in the SIP ALG packet processing service of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) to the device by sending specific types of valid SIP traffic to the device. In this case, the flowd process crashes and generates a core dump while processing SIP ALG traffic.

Continued receipt of these valid SIP packets will result in a sustained Denial of Service (DoS) condition.

This issue affects:

Juniper Networks Junos OS:

12.3X48 versions prior to 12.3X48-D61, 12.3X48-D65 on SRX Series;

15.1X49 versions prior to 15.1X49-D130 on SRX Series;

17.3 versions prior to 17.3R3 on SRX Series;

17.4 versions prior to 17.4R2 on SRX Series.

This issue only affects SRX Series devices where SIP ALG is enabled.

The following minimum configuration is required:

set security alg sip

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-2019-0055.

Solution:
The following software releases have been updated to resolve this specific issue: 12.3X48-D61, 12.3X48-D65, 15.1X49-D130, 17.3R3, 17.4R2, 18.1R1, and all subsequent releases.

This issue is being tracked as PR 1329170 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 SIP ALG if this is not needed, otherwise 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:
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."
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