LF-Edge EVE OS up to 8.5.x/9.4.x Pillar Eve Container global.json insufficiently protected credentials

Summaryinfo

A vulnerability, which was classified as critical, was found in LF-Edge EVE OS up to 8.5.x/9.4.x. Affected by this vulnerability is an unknown functionality of the file /config/GlobalConfig/global.json of the component Pillar Eve Container. Executing a manipulation can lead to insufficiently protected credentials. This vulnerability is registered as CVE-2023-43633. The attack needs to be launched locally. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in LF-Edge EVE OS up to 8.5.x/9.4.x. This vulnerability affects some unknown functionality of the file /config/GlobalConfig/global.json of the component Pillar Eve Container. The manipulation with an unknown input leads to a insufficiently protected credentials vulnerability. The CWE definition for the vulnerability is CWE-522. The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

On boot, the Pillar eve container checks for the existence and content of “/config/GlobalConfig/global.json”. If the file exists, it overrides the existing configuration on the device on boot. This allows an attacker to change the system’s configuration, which also includes some debug functions. This could be used to unlock the ssh with custom “authorized_keys” via the “debug.enable.ssh” key, similar to the “authorized_keys” finding that was noted before. Other usages include unlocking the usb to enable the keyboard via the “debug.enable.usb” key, allowing VNC access via the “app.allow.vnc” key, and more. An attacker could easily enable these debug functionalities without triggering the “measured boot” mechanism implemented by EVE OS, and without marking the device as “UUD” (“Unknown Update Detected”). This is because the “/config” partition is not protected by “measured boot”, it is mutable and it is not encrypted in any way. An attacker can gain full control over the device without changing the PCR values, thereby not triggering the “measured boot” mechanism, and having full access to the vault. Note: This issue was partially fixed in these commits (after disclosure to Zededa), where the config partition measurement was added to PCR13: • aa3501d6c57206ced222c33aea15a9169d629141 • 5fef4d92e75838cc78010edaed5247dfbdae1889. This issue was made viable in version 9.0.0 when the calculation was moved to PCR14 but it was not included in the measured boot.

The weakness was published 09/21/2023. The advisory is available at asrg.io. This vulnerability was named CVE-2023-43633 since 09/20/2023. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1552 by the MITRE ATT&CK project.

By approaching the search of inurl:config/GlobalConfig/global.json it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 8.6.0 or 9.5.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-48033). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• LF-Edge

Name

• EVE OS

Version

• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 9.0
• 9.1
• 9.2
• 9.3
• 9.4

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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