CVE-2023-20135

A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.

CVSS v3 7.0 HIGH

7.0^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.0 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:cisco:ios_xr::::::::
	cpe:2.3:o:cisco:ios_xr::::::::

History

No history.

Information

Published : 2023-09-13 17:15

Updated : 2024-01-25 17:15

NVD link : CVE-2023-20135

Mitre link : CVE-2023-20135

CVE.ORG link : CVE-2023-20135

JSON object : View

Products Affected

cisco

ios_xr

CWE

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

CWE-347

Improper Verification of Cryptographic Signature

{"id": "CVE-2023-20135", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.0, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.0}, {"type": "Secondary", "source": "ykramarz@cisco.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.7, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 0.5}]}, "published": "2023-09-13T17:15:09.253", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5", "tags": ["Vendor Advisory"], "source": "ykramarz@cisco.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-367"}]}, {"type": "Secondary", "source": "ykramarz@cisco.com", "description": [{"lang": "en", "value": "CWE-347"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system.\r\n\r This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device."}, {"lang": "es", "value": "Una vulnerabilidad en las comprobaciones de verificaci\u00f3n de im\u00e1genes del Software Cisco IOS XR podr\u00eda permitir que un atacante local autenticado ejecute c\u00f3digo arbitrario en el sistema operativo subyacente. Esta vulnerabilidad se debe a una condici\u00f3n de ejecuci\u00f3n de tiempo de verificaci\u00f3n, tiempo de uso (TOCTOU) cuando se realiza una consulta de instalaci\u00f3n relacionada con una imagen ISO durante una operaci\u00f3n de instalaci\u00f3n que utiliza una imagen ISO. Un atacante podr\u00eda aprovechar esta vulnerabilidad modificando una imagen ISO y luego realizando solicitudes de instalaci\u00f3n en paralelo. Una explotaci\u00f3n existosa podr\u00eda permitir al atacante ejecutar c\u00f3digo arbitrario en un dispositivo afectado."}], "lastModified": "2024-01-25T17:15:31.443", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "93148C76-2970-48D4-942A-D67B68352EA9", "versionEndExcluding": "7.6", "versionStartIncluding": "7.5.2"}, {"criteria": "cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "75317BEF-7612-49E8-A4B2-9C90AADE3BB0", "versionEndExcluding": "7.10.1", "versionStartIncluding": "7.7"}], "operator": "OR"}]}], "sourceIdentifier": "ykramarz@cisco.com"}