CVE-2020-9015: Arista DCS-7050QX-32S-R 4.20.9M, DCS-7050CX3-32S-R 4.20.11M, and DCS-7280SRAM-48C6-R 4.22.0.1F devices (and possibly other products) allow attackers to bypass…

PriorityP271critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EXPLOIT

EPSS

16.08%

96.5th percentile

Arista DCS-7050QX-32S-R 4.20.9M, DCS-7050CX3-32S-R 4.20.11M, and DCS-7280SRAM-48C6-R 4.22.0.1F devices (and possibly other products) allow attackers to bypass intended TACACS+ shell restrictions via a | character. NOTE: the vendor reports that this is a configuration issue relating to an overly permissive regular expression in the TACACS+ server permitted commands

Affected

3 ranges

Vendor	Product	Version range	Fixed in
arista	dcs-7050cx3-32s-r_firmware	—	—
arista	dcs-7050qx-32s-r_firmware	—	—
arista	dcs-7280sram-48c6-r_firmware	—	—

Detection & IOCsextracted from sources · hover to see the quote

command|↗

→Monitor TACACS+ shell sessions on Arista devices for pipe character (`|`) injection attempts used to escape restricted shell environments. ↗
→A Metasploit module exists for this vulnerability targeting Arista devices via SSH with TACACS+ read-only accounts; monitor for exploitation attempts combining SSH access with privilege escalation. ↗

·The vulnerability is rooted in a misconfiguration — an overly permissive regular expression in the TACACS+ server permitted commands list — rather than a software bug. Audit TACACS+ permitted command regexes on Arista devices. ↗
·Affected device models confirmed include DCS-7050QX-32S-R (4.20.9M), DCS-7050CX3-32S-R (4.20.11M), and DCS-7280SRAM-48C6-R (4.22.0.1F); other Arista products may also be impacted. ↗

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvdv2.07.5HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P

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