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Description

Perle IOLAN STS/SCS terminal server models with firmware versions prior to 6.0 allow authenticated OS command injection via the restricted shell accessed over Telnet or SSH. The shell 'ps' command does not perform proper argument sanitization and passes user-supplied parameters into an 'sh -c' invocation running as root. An authenticated attacker who can log in to the device can inject shell metacharacters after the 'ps' subcommand to execute arbitrary OS commands with root privileges, leading to full compromise of the underlying operating system.

PUBLISHED Reserved 2026-01-15 | Published 2026-03-17 | Updated 2026-03-17 | Assigner VulnCheck




HIGH: 8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Product status

Default status
unaffected

Any version before 6.0
affected

Default status
unaffected

Any version before 6.0
affected

Credits

Victor A. Morales, Senior Pentester Team Leader, GM Sectec, Corp. finder

Omar Crespo, Pentester, GM Sectec, Corp. finder

VulnCheck coordinator

References

www.perle.com/downloads/server_sds_sts_rackmount.shtml product

www.perle.com/...documentation_pdfs/iolan_scs-sds-sts_ug.pdf product

www.vulncheck.com/...nticated-command-injection-via-shell-ps third-party-advisory

cve.org (CVE-2026-23759)

nvd.nist.gov (CVE-2026-23759)

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