CVE-2022-26952 – CVE-2022-26952 is a buffer overflow vulnerabili... (How to Fix)

Q: What is the severity of CVE-2022-26952?

CVE-2022-26952 has a CVSS score of 7.5 (HIGH). CVE-2022-26952 is a buffer overflow vulnerability in Digi Passport firmware that allows unauthenticated remote attackers to execute arbitrary code or cause denial of service. The vulnerability occurs when building the Location header string during authentication page redirection. All Digi Passport devices running firmware versions up to 1.5.1.1 are affected.

📋 TL;DR

CVE-2022-26952 is a buffer overflow vulnerability in Digi Passport firmware that allows unauthenticated remote attackers to execute arbitrary code or cause denial of service. The vulnerability occurs when building the Location header string during authentication page redirection. All Digi Passport devices running firmware versions up to 1.5.1.1 are affected.

💻 Affected Systems

Products:

Digi Passport

Versions: All versions through 1.5.1.1

Operating Systems: Embedded firmware

Default Config Vulnerable: ⚠️ Yes

Notes: All default configurations are vulnerable. No special configuration required for exploitation.

📦 What is this software?

Passport Firmware by Digi

View all CVEs affecting Passport Firmware →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete device compromise, lateral movement within network, and persistent backdoor installation.

🟠

Likely Case

Denial of service causing device reboot or crash, potentially disrupting network management operations.

🟢

If Mitigated

Limited impact if network segmentation prevents external access and proper authentication controls are in place.

🌐 Internet-Facing: HIGH - Unauthenticated remote exploitation possible from internet-facing devices.

🏢 Internal Only: MEDIUM - Internal attackers could exploit if they have network access to vulnerable devices.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Public proof-of-concept code exists demonstrating exploitation. The vulnerability requires no authentication and has straightforward exploitation.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.5.2

Vendor Advisory: https://hub.digi.com/dp/path=/support/asset/digi-passport-1.5.2-firmware-release-notes/

Restart Required: Yes

Instructions:

1. Download firmware version 1.5.2 from Digi support portal. 2. Log into Digi Passport web interface. 3. Navigate to System > Firmware Update. 4. Upload and install the new firmware. 5. Reboot device after installation completes.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate Digi Passport devices from untrusted networks and restrict access to management interfaces.

Access Control Lists

all

Implement firewall rules to restrict access to Digi Passport web interface (typically port 80/443).

🧯 If You Can't Patch

Implement strict network segmentation to isolate Digi Passport devices from untrusted networks
Deploy web application firewall (WAF) rules to detect and block buffer overflow attempts

🔍 How to Verify

Check if Vulnerable:

Check firmware version in web interface under System > Status. If version is 1.5.1.1 or earlier, device is vulnerable.

Check Version:

No CLI command available. Check via web interface at System > Status or use SNMP query to device firmware version.

Verify Fix Applied:

Verify firmware version shows 1.5.2 or later in System > Status page after update.

📡 Detection & Monitoring

Log Indicators:

Multiple failed authentication attempts followed by unusual HTTP requests
Device reboot logs without normal shutdown sequence
Unusual process creation in system logs

Network Indicators:

HTTP requests with unusually long Location header parameters
Traffic patterns showing buffer overflow attempts to authentication endpoints
Unexpected outbound connections from Digi Passport devices

SIEM Query:

source="digi-passport" AND (http_uri CONTAINS "/auth" OR http_user_agent CONTAINS "overflow")

📊 Metadata

CVE ID: CVE-2022-26952

CVSS v3 Score: 7.5 (HIGH)

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

CWE: CWE-787

Published: April 6, 2022

Last Updated: November 21, 2024

🔗 References

https://github.com/X-C3LL/PoC-CVEs/blob/master/CVE-2022-26952%20%26%20CVE-2022-26953/readme.md Exploit,Third Party Advisory
https://hub.digi.com/dp/path=/support/asset/digi-passport-1.5.2-firmware-release-notes/ Release Notes,Vendor Advisory
https://hub.digi.com/support/products/infrastructure-management/digi-passport/ Patch,Product,Vendor Advisory
https://github.com/X-C3LL/PoC-CVEs/blob/master/CVE-2022-26952%20%26%20CVE-2022-26953/readme.md Exploit,Third Party Advisory
https://hub.digi.com/dp/path=/support/asset/digi-passport-1.5.2-firmware-release-notes/ Release Notes,Vendor Advisory
https://hub.digi.com/support/products/infrastructure-management/digi-passport/ Patch,Product,Vendor Advisory

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