CVE-2020-7805 – CVE-2020-7805 is a command injection vulnerabil... (How to Fix)

Q: What is the severity of CVE-2020-7805?

CVE-2020-7805 has a CVSS score of 9.8 (CRITICAL). CVE-2020-7805 is a command injection vulnerability in KT Slim egg IML500 and IML520 WiFi devices that allows attackers to execute arbitrary operating system commands. This affects specific hardware models from KT Corporation, potentially enabling complete device compromise. Attackers can exploit this vulnerability remotely without authentication.

📋 TL;DR

CVE-2020-7805 is a command injection vulnerability in KT Slim egg IML500 and IML520 WiFi devices that allows attackers to execute arbitrary operating system commands. This affects specific hardware models from KT Corporation, potentially enabling complete device compromise. Attackers can exploit this vulnerability remotely without authentication.

💻 Affected Systems

Products:

KT Slim egg IML500
KT Slim egg IML520

Versions: All versions prior to patch

Operating Systems: Embedded firmware

Default Config Vulnerable: ⚠️ Yes

Notes: Affects specific hardware models: IML500 (R7283, R8112, R8424) and IML520 (R8112, R8368, R8411)

📦 What is this software?

Iml500 Firmware by Infomark

View all CVEs affecting Iml500 Firmware →

Iml520 Firmware by Infomark

View all CVEs affecting Iml520 Firmware →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete device takeover leading to network compromise, data exfiltration, and use as pivot point for lateral movement within the network.

🟠

Likely Case

Device compromise allowing attackers to modify configurations, intercept traffic, or use device as part of botnet.

🟢

If Mitigated

Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.

🌐 Internet-Facing: HIGH - These are network devices that may be directly exposed to the internet, allowing remote exploitation.

🏢 Internal Only: MEDIUM - Still vulnerable to internal attackers or compromised internal systems.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Command injection vulnerabilities are typically easy to exploit once the attack vector is identified.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check vendor for latest firmware updates

Vendor Advisory: http://www.infomark.co.kr/bbs/board.php?bo_table=download&wr_id=57&sfl=wr_subject&stx=520&sop=and

Restart Required: Yes

Instructions:

1. Check current firmware version. 2. Download latest firmware from vendor site. 3. Upload firmware via device management interface. 4. Reboot device after update.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate affected devices in separate VLAN with strict firewall rules

Access Control

all

Restrict management interface access to trusted IP addresses only

🧯 If You Can't Patch

Replace vulnerable devices with updated models or alternative products
Implement strict network monitoring and anomaly detection for these devices

🔍 How to Verify

Check if Vulnerable:

Check device model and firmware version against affected list. Attempt to access device management interface and review for command injection vectors.

Check Version:

Check via device web interface or SSH/Telnet if available: show version or similar command

Verify Fix Applied:

Verify firmware version has been updated to latest release. Test for command injection using safe payloads if possible.

📡 Detection & Monitoring

Log Indicators:

Unusual command execution in device logs
Multiple failed login attempts
Configuration changes from unknown sources

Network Indicators:

Unusual outbound connections from device
Traffic to known malicious IPs
Anomalous protocol usage

SIEM Query:

source="kt-slim-egg" AND (event_type="command_execution" OR event_type="config_change")

📊 Metadata

CVE ID: CVE-2020-7805

CVSS v3 Score: 9.8 (CRITICAL)

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

CWE: CWE-78

Published: May 7, 2020

Last Updated: November 21, 2024

🔗 References

http://www.infomark.co.kr/bbs/board.php?bo_table=download&wr_id=57&sfl=wr_subject&stx=520&sop=and Vendor Advisory
https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=35362 Third Party Advisory
http://www.infomark.co.kr/bbs/board.php?bo_table=download&wr_id=57&sfl=wr_subject&stx=520&sop=and Vendor Advisory
https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=35362 Third Party Advisory

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🔗 Related Vulnerabilities

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