CVE-2020-8905

A buffer length validation vulnerability in Asylo versions prior to 0.6.0 allows an attacker to read data they should not have access to. The 'enc_untrusted_recvfrom' function generates a return value which is deserialized by 'MessageReader', and copied into three different 'extents'. The length of the third 'extents' is controlled by the outside world, and not verified on copy, allowing the attacker to force Asylo to copy trusted memory data into an untrusted buffer of significantly small length.. We recommend updating Asylo to version 0.6.0 or later.

CVSS v3 2.8 LOW
CVSS v2.0 4.0 MEDIUM

2.8^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.1 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

4.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:S/C:P/I:N/A:N

Exploitability : 8.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

References

Link	Resource
https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93	Patch Third Party Advisory
https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93	Patch Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:google:asylo:*:*:*:*:*:*:*:*

History

21 Nov 2024, 05:39

Type	Values Removed	Values Added
CVSS	v2 : ~~4.0~~ v3 : ~~6.5~~	v2 : 4.0 v3 : 2.8
References	~~() https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93 - Patch, Third Party Advisory~~	() https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93 - Patch, Third Party Advisory

Information

Published : 2020-08-12 19:15

Updated : 2024-11-21 05:39

NVD link : CVE-2020-8905

Mitre link : CVE-2020-8905

CVE.ORG link : CVE-2020-8905

JSON object : View

Products Affected

google

asylo

CWE

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

{"id": "CVE-2020-8905", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N", "authentication": "SINGLE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 8.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Secondary", "source": "cve-coordination@google.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 2.8, "attackVector": "LOCAL", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 1.1}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "published": "2020-08-12T19:15:14.670", "references": [{"url": "https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93", "tags": ["Patch", "Third Party Advisory"], "source": "cve-coordination@google.com"}, {"url": "https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93", "tags": ["Patch", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "cve-coordination@google.com", "description": [{"lang": "en", "value": "CWE-120"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-120"}]}], "descriptions": [{"lang": "en", "value": "A buffer length validation vulnerability in Asylo versions prior to 0.6.0 allows an attacker to read data they should not have access to. The 'enc_untrusted_recvfrom' function generates a return value which is deserialized by 'MessageReader', and copied into three different 'extents'. The length of the third 'extents' is controlled by the outside world, and not verified on copy, allowing the attacker to force Asylo to copy trusted memory data into an untrusted buffer of significantly small length.. We recommend updating Asylo to version 0.6.0 or later."}, {"lang": "es", "value": "Una vulnerabilidad de comprobaci\u00f3n de longitud del b\u00fafer en Asylo versiones anteriores a 0.6.0, permite a un atacante leer datos a los que no deber\u00eda tener acceso. La funci\u00f3n \"enc_untrusted_recvfrom\" genera un valor de retorno que es deserializado por \"lMessageReader\" y copiado en tres \"extents\" diferentes. La longitud de los ''extents\" de terceros es controlada por el mundo exterior y no es verificada en la copia, permitiendo al atacante forzar a Asylo a copiar datos de memoria confiables en un b\u00fafer no confiable de longitud significativamente peque\u00f1a. Recomendamos actualizar Asylo en las versiones 0.6. 0 o posteriores"}], "lastModified": "2024-11-21T05:39:39.820", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:google:asylo:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2E43ACF0-4DFF-4A7A-BC8B-90E067F13206", "versionEndExcluding": "0.6.0"}], "operator": "OR"}]}], "sourceIdentifier": "cve-coordination@google.com"}