Remote code execution in Junos OS and Junos OS Evolved



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-0208
CWE-ID CWE-20
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 Junos OS Evolved
Operating systems & Components / Operating system

Juniper Junos OS
Operating systems & Components / Operating system

Vendor Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Input validation error

EUVDB-ID: #VU49560

Risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-0208

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input in the Routing Protocol Daemon (RPD) service. A remote attacker can send specially crafted RSVP packets when bidirectional LSPs and perform a denial of service attack or execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

This issue affects:

Juniper Networks Junos OS:

  • All versions prior to 17.3R3-S10 except 15.1X49-D240 for SRX series;
  • 17.4 versions prior to 17.4R3-S2;
  • 18.1 versions prior to 18.1R3-S10;
  • 18.2 versions prior to 18.2R2-S7, 18.2R3-S4;
  • 18.3 versions prior to 18.3R3-S2;
  • 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S2;
  • 19.1 versions prior to 19.1R1-S5, 19.1R3-S3;
  • 19.2 versions prior to 19.2R3;
  • 19.3 versions prior to 19.3R2-S5, 19.3R3;
  • 19.4 versions prior to 19.4R2-S2, 19.4R3-S1;
  • 20.1 versions prior to 20.1R1-S4, 20.1R2;
  • 15.1X49 versions prior to 15.1X49-D240 on SRX Series.

Juniper Networks Junos OS Evolved:

  • 19.3 versions prior to 19.3R2-S5-EVO;
  • 19.4 versions prior to 19.4R2-S2-EVO;
  • 20.1 versions prior to 20.1R1-S4-EVO.

Vulnerable software versions

Junos OS Evolved: 19.4 - 20.1

Juniper Junos OS: 15.1F2-S1 - 20.2

CPE2.3 External links

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11098&cat=SIRT_1&actp=LIST


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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