CVE-2023-38201
published 2023-08-25CVE-2023-38201: A flaw was found in the Keylime registrar that could allow a bypass of the challenge-response protocol during agent registration. This issue may allow an…
PriorityP429medium6.5CVSS 3.1
AVAACLPRNUINSUCNIHAN
EPSS
0.46%
37.3th percentile
A flaw was found in the Keylime registrar that could allow a bypass of the challenge-response protocol during agent registration. This issue may allow an attacker to impersonate an agent and hide the true status of a monitored machine if the fake agent is added to the verifier list by a legitimate user, resulting in a breach of the integrity of the registrar database.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| fedoraproject | fedora | — | — |
| keylime | keylime | < 7.5.0 | 7.5.0 |
| keylime | keylime | >= 0 < 7.5.0 | 7.5.0 |
| keylime | keylime | >= 0 < 9e5ac9f25cd400b16d5969f531cee28290543f2a | 9e5ac9f25cd400b16d5969f531cee28290543f2a |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux_eus | — | — |
| redhat | enterprise_linux_for_ibm_z_systems | — | — |
| redhat | enterprise_linux_for_ibm_z_systems_eus | — | — |
| redhat | enterprise_linux_for_power_little_endian | — | — |
| redhat | enterprise_linux_for_power_little_endian_eus | — | — |
| redhat | enterprise_linux_server_aus | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
vendor_redhat6.5MEDIUM
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OSV
Keylime registrar and (untrusted) Agent can be bypassed by an attacker
osv·2023-09-06
CVE-2023-38201 [HIGH] Keylime registrar and (untrusted) Agent can be bypassed by an attacker
Keylime registrar and (untrusted) Agent can be bypassed by an attacker
### Impact
A security issue was found in the Keylime `registrar` code which allows an attacker to effectively bypass the challenge-response protocol used to verify that an `agent` has indeed access to an AIK which in indeed related to the EK.
When an `agent` starts up, it will contact a `registrar` and provide a public EK and public AIK, in addition to the EK Certificate. This `registrar` will then challenge the `agent` to decrypt a challenge encrypted with the EK.
When receiving the wrong "auth_tag" back from the `agent` during activation, the `registrar` answers with an error message that contains the expected correct "auth_tag" (an HMAC which is calculated within the `registrar` for checking). An attacker could s
GHSA
Keylime registrar and (untrusted) Agent can be bypassed by an attacker
ghsa·2023-09-06
CVE-2023-38201 [HIGH] CWE-639 Keylime registrar and (untrusted) Agent can be bypassed by an attacker
Keylime registrar and (untrusted) Agent can be bypassed by an attacker
### Impact
A security issue was found in the Keylime `registrar` code which allows an attacker to effectively bypass the challenge-response protocol used to verify that an `agent` has indeed access to an AIK which in indeed related to the EK.
When an `agent` starts up, it will contact a `registrar` and provide a public EK and public AIK, in addition to the EK Certificate. This `registrar` will then challenge the `agent` to decrypt a challenge encrypted with the EK.
When receiving the wrong "auth_tag" back from the `agent` during activation, the `registrar` answers with an error message that contains the expected correct "auth_tag" (an HMAC which is calculated within the `registrar` for checking). An attacker could s
OSV
CVE-2023-38201: A flaw was found in the Keylime registrar that could allow a bypass of the challenge-response protocol during agent registration
osv·2023-08-25
CVE-2023-38201 CVE-2023-38201: A flaw was found in the Keylime registrar that could allow a bypass of the challenge-response protocol during agent registration
A flaw was found in the Keylime registrar that could allow a bypass of the challenge-response protocol during agent registration. This issue may allow an attacker to impersonate an agent and hide the true status of a monitored machine if the fake agent is added to the verifier list by a legitimate user, resulting in a breach of the integrity of the registrar database.
Red Hat
Keylime: challenge-response protocol bypass during agent registration
vendor_redhat·2023-08-23·CVSS 6.5
CVE-2023-38201 [MEDIUM] CWE-639 Keylime: challenge-response protocol bypass during agent registration
Keylime: challenge-response protocol bypass during agent registration
A flaw was found in the Keylime registrar that could allow a bypass of the challenge-response protocol during agent registration. This issue may allow an attacker to impersonate an agent and hide the true status of a monitored machine if the fake agent is added to the verifier list by a legitimate user, resulting in a breach of the integrity of the registrar database.
A flaw was found in the Keylime registrar that could allow a bypass of the challenge-response protocol during agent registration. This issue may allow an attacker to impersonate an agent and hide the true status of a monitored machine if the fake agent is added to the verifier list by a legitimate user, resulting in a breach of the integrity of the regist
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://access.redhat.com/errata/RHSA-2023:5080https://access.redhat.com/security/cve/CVE-2023-38201https://bugzilla.redhat.com/show_bug.cgi?id=2222693https://github.com/keylime/keylime/commit/9e5ac9f25cd400b16d5969f531cee28290543f2ahttps://github.com/keylime/keylime/security/advisories/GHSA-f4r5-q63f-gcwwhttps://access.redhat.com/errata/RHSA-2023:5080https://access.redhat.com/security/cve/CVE-2023-38201https://bugzilla.redhat.com/show_bug.cgi?id=2222693https://github.com/keylime/keylime/commit/9e5ac9f25cd400b16d5969f531cee28290543f2ahttps://github.com/keylime/keylime/security/advisories/GHSA-f4r5-q63f-gcwwhttps://lists.fedoraproject.org/archives/list/[email protected]/message/ZIZZB5NHNCS5D2AEH3ZAO6OQC72IK7WS/
2023-08-25
Published