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2021-01 Security Bulletin: Junos OS: NFX Series, SRX Series: PFE may crash upon receipt of specific packet when SSL Proxy is configured. (CVE-2021-0206)

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Article ID: JSA11096 SECURITY_ADVISORIES Last Updated: 13 Jan 2021Version: 3.0
Product Affected:
This issue affects Junos OS 18.3, 18.4, 19.1, 19.2, 19.3. Affected platforms: NFX Series, SRX Series.
Problem:

A NULL Pointer Dereference vulnerability in Juniper Networks Junos OS allows an attacker to send a specific packet causing the packet forwarding engine (PFE) to crash and restart, resulting in a Denial of Service (DoS).

By continuously sending these specific packets, an attacker can repeatedly disable the PFE causing a sustained Denial of Service (DoS).

This issue only affects Juniper Networks NFX Series, SRX Series platforms when SSL Proxy is configured.

This issue affects Juniper Networks Junos OS on NFX Series and SRX Series:

  • 18.3 versions prior to 18.3R3-S4;
  • 18.4 versions prior to 18.4R3-S1;
  • 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3;
  • 19.2 versions prior to 19.2R1-S2, 19.2R2;
  • 19.3 versions prior to 19.3R2.

This issue does not affect Juniper Networks Junos OS versions on NFX Series and SRX Series prior to 18.3R1.

The example of the configuration stanza affected by this issue is as follows:

[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-2021-0206.

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 18.3R3-S4, 18.4R3-S1, 19.1R1-S6, 19.1R2-S2, 19.1R3, 19.2R1-S2, 19.2R2, 19.3R2, 19.4R1 and all subsequent releases.
This issue is being tracked as 1467856.

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:
2021-01-13: 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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