Remote code execution in Junos OS and Junos OS Evolved

1) Input validation error

EUVDB-ID: #VU49560

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

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 - 20.1R1-S2-EVO

Juniper Junos OS: 15.1 - 20.2

External links

http://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.