CVE-2009-5156
published 2019-06-11CVE-2009-5156: An issue was discovered on ASMAX AR-804gu 66.34.1 devices. There is Command Injection via the cgi-bin/script query string.
PriorityP181critical9.8CVSS 3.0
AVNACLPRNUINSUCHIHAH
ITWVulnCheck KEV
Exploited in the wild
EPSS
10.92%
95.3th percentile
An issue was discovered on ASMAX AR-804gu 66.34.1 devices. There is Command Injection via the cgi-bin/script query string.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| veracomp | asmax_ar-804gu_firmware | — | — |
Detection & IOCsextracted from sources · hover to see the quote
url/cgi-bin/script?system
snort
alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS ASMAX CGI script system Parameter Command Injection Attempt (CVE-2009-5156)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/cgi-bin/script?system"; startswith; fast_pattern; reference:cve,2009-5156; classtype:attempted-admin; sid:2065221; rev:1; metadata:affected_product ASMAX, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_10_16, cve CVE_2009_5156, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)
- →Exploit traffic is plaintext HTTP (not TLS); deploy detection at the network perimeter and internally on HTTP traffic.
- →Look for HTTP GET requests where the URI starts with /cgi-bin/script?system — the 'system' query parameter is the injection point.
- →Target affected device: ASMAX AR-804gu firmware version 66.34.1 networking equipment. ↗
- →Classify detections as attempted-admin (privilege escalation via command injection on networking equipment); maps to MITRE ATT&CK T1190 (Exploit Public-Facing Application) under tactic TA0001 (Initial Access).
- ·The Snort/Suricata rule uses 'startswith' on the URI content match, meaning it only fires when the URI begins exactly with /cgi-bin/script?system. Variants that include path prefixes or URL encoding may evade this rule.
- ·Rule is scoped to $HOME_NET as the destination; ensure $HOME_NET is correctly defined to include ASMAX device IP ranges, otherwise internal-only deployments may miss inbound exploitation.
CVSS provenance
nvdv3.09.8CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.010.0CRITICALAV:N/AC:L/Au:N/C:C/I:C/A:C
vulncheck9.8CRITICAL
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GHSA
GHSA-r59r-63rw-fm95: An issue was discovered on ASMAX AR-804gu 66
ghsa_unreviewed·2022-04-21
CVE-2009-5156 [CRITICAL] CWE-77 GHSA-r59r-63rw-fm95: An issue was discovered on ASMAX AR-804gu 66
An issue was discovered on ASMAX AR-804gu 66.34.1 devices. There is Command Injection via the cgi-bin/script query string.
VulnCheck
veracomp asmax_ar-804gu_firmware Improper Neutralization of Special Elements used in a Command ('Command Injection')
vulncheck·2009·CVSS 9.8
CVE-2009-5156 [CRITICAL] veracomp asmax_ar-804gu_firmware Improper Neutralization of Special Elements used in a Command ('Command Injection')
veracomp asmax_ar-804gu_firmware Improper Neutralization of Special Elements used in a Command ('Command Injection')
An issue was discovered on ASMAX AR-804gu 66.34.1 devices. There is Command Injection via the cgi-bin/script query string.
Affected: veracomp asmax_ar-804gu_firmware
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Exploitation References: https://www.akamai.com/blog/security/latest-echobot-26-infection-vectors; https://www.researchgate.net/publication/348602660_An_analysis_of_the_use_of_CVEs_by_IoT_malware
Suricata
ET WEB_SPECIFIC_APPS ASMAX CGI script system Parameter Command Injection Attempt (CVE-2009-5156)
suricata·2025-10-16·CVSS 9.8
CVE-2009-5156 [CRITICAL] ET WEB_SPECIFIC_APPS ASMAX CGI script system Parameter Command Injection Attempt (CVE-2009-5156)
ET WEB_SPECIFIC_APPS ASMAX CGI script system Parameter Command Injection Attempt (CVE-2009-5156)
Rule: alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS ASMAX CGI script system Parameter Command Injection Attempt (CVE-2009-5156)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/cgi-bin/script?system"; startswith; fast_pattern; reference:cve,2009-5156; classtype:attempted-admin; sid:2065221; rev:1; metadata:affected_product ASMAX, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_10_16, cve CVE_2009_5156, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_16, mitre_tactic_id TA0001, mitre_ta
No public exploits indexed.
Unit42
Mirai Variant ECHOBOT Resurfaces with 13 Previously Unexploited Vulnerabilities
blogs_unit42·2019-12-13
Mirai Variant ECHOBOT Resurfaces with 13 Previously Unexploited Vulnerabilities
Threat Research Center
Threat Research
Malware
## Mirai Variant ECHOBOT Resurfaces with 13 Previously Unexploited Vulnerabilities
Ruchna Nigam
Published: December 13, 2019
Malware
Threat Research
Vulnerabilities
Echobot
IoT
IoT Vulnerability
Mirai
Mirai variant
## Executive Summary
Since the discovery of the Mirai variant using the binary name ECHOBOT in May 2019, it has resurfaced from time to time, using new infrastructure, and more remarkably, adding to the list of vulnerabilities it scans for, as a means to increase its attack surface with each evolution.
Unlike other Mirai variants, this particular variant stands out for the sheer number of exploits it incorporates, with the latest version having a total of 71 unique exploits, 13 of which haven’t been seen exploite
Unit42
Mirai Variant ECHOBOT Resurfaces with 13 Previously Unexploited Vulnerabilities
blogs_unit42·2019-12-13
Mirai Variant ECHOBOT Resurfaces with 13 Previously Unexploited Vulnerabilities
## Executive Summary
Since the discovery of the Mirai variant using the binary name ECHOBOT in May 2019, it has resurfaced from time to time, using new infrastructure, and more remarkably, adding to the list of vulnerabilities it scans for, as a means to increase its attack surface with each evolution.
Unlike other Mirai variants, this particular variant stands out for the sheer number of exploits it incorporates, with the latest version having a total of 71 unique exploits, 13 of which haven’t been seen exploited in the wild until now, ranging from extremely old CVEs from as long back as 2003, to recent vulnerabilities made public as recently as early December 2019. Based on this seemingly odd choice, one could risk a guess that the attackers could potentially be aiming for the sweet sp
2019-06-11
Published
Exploited in the wild