CVE-2023-43630
8.8 High
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
8.5 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
9.2%
PCR14 is not in the list of PCRs that seal/unseal the “vault” key, but
due to the change that was implemented in commit
“7638364bc0acf8b5c481b5ce5fea11ad44ad7fd4”, fixing this issue alone would not solve the
problem of the config partition not being measured correctly.
Also, the “vault” key is sealed/unsealed with SHA1 PCRs instead of
SHA256.
This issue was somewhat mitigated due to all of the PCR extend functions
updating both the values of SHA256 and SHA1 for a given PCR ID.
However, due to the change that was implemented in commit
“7638364bc0acf8b5c481b5ce5fea11ad44ad7fd4”, this is no longer the case for PCR14, as
the code in “measurefs.go” explicitly updates only the SHA256 instance of PCR14, which
means that even if PCR14 were to be added to the list of PCRs sealing/unsealing the “vault”
key, changes to the config partition would still not be measured.
An attacker could modify the config partition without triggering the measured boot, this could
result in the attacker gaining full control over the device with full access to the contents of the
encrypted “vault”
Affected configurations
| CPE | Name | Operator | Version |
|---|---|---|---|
| linuxfoundation:edge_virtualization_engine | linuxfoundation edge virtualization engine | lt | 9.5.0 |
CNA Affected
[
{
"defaultStatus": "unaffected",
"packageName": "EVE OS",
"product": "EVE OS",
"programFiles": [
"https://github.com/lf-edge/eve/blob/master/pkg/measure-config/src/measurefs.go",
"https://github.com/lf-edge/eve/blob/master/pkg/pillar/evetpm/tpm.go"
],
"repo": "https://github.com/lf-edge/eve",
"vendor": " LF-Edge, Zededa",
"versions": [
{
"lessThan": "9.5.0",
"status": "affected",
"version": "9.0.0",
"versionType": "release"
}
]
}
]Related
8.8 High
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
8.5 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
9.2%