ASRGCVE-2023-43631CVE-2023-43631
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
9.0%
On boot, the Pillar eve container checks for the existence and content of
“/config/authorized_keys”.
If the file is present, and contains a supported public key, the container will go on to open
port 22 and enable sshd with the given keys as the authorized keys for root login.
An attacker could easily add their own keys and gain full control over the system 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, thus 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.
Affected configurations
| Vendor | Product | Version | CPE |
|---|---|---|---|
| linuxfoundation | edge_virtualization_engine | * | cpe:2.3:o:linuxfoundation:edge_virtualization_engine:*:*:*:*:*:*:*:* |
CNA Affected
[
{
"defaultStatus": "unaffected",
"packageName": "EVE OS",
"product": "EVE OS",
"programFiles": [
"https://github.com/lf-edge/eve/tree/master/pkg/pillar/evetpm/tpm.go",
"https://github.com/lf-edge/eve/tree/master/pkg/grub/rootfs.cfg"
],
"repo": "https://github.com/lf-edge/eve",
"vendor": " LF-Edge, Zededa",
"versions": [
{
"lessThan": "8.6.0",
"status": "affected",
"version": "0",
"versionType": "release"
},
{
"lessThan": "9.5.0",
"status": "affected",
"version": "9.0.0",
"versionType": "release"
}
]
}
]Related
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
9.0%