CVE-2021-26556

When Octopus Server is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access.

CVSS v3 7.8 HIGH
CVSS v2.0 4.4 MEDIUM

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

4.4^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 3.4 / Impact : 6.4

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://advisories.octopus.com/adv/2021-01---Local-privilege-escalation-in-Octopus-Server-%28CVE-2021-26556%29.1733296189.html

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:octopus:octopus_deploy::::::::
	cpe:2.3:a:octopus:octopus_server::::::::

History

27 Jul 2022, 16:57

Type	Values Removed	Values Added
CPE		cpe:2.3:a:octopus:octopus_server::::::::

15 Oct 2021, 16:36

Type	Values Removed	Values Added
CWE		CWE-426
References	~~(MISC) https://advisories.octopus.com/adv/2021-01---Local-privilege-escalation-in-Octopus-Server-(CVE-2021-26556).1733296189.html -~~	(MISC) https://advisories.octopus.com/adv/2021-01---Local-privilege-escalation-in-Octopus-Server-(CVE-2021-26556).1733296189.html - Vendor Advisory
CPE		cpe:2.3:a:octopus:octopus_deploy::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : 4.4 v3 : 7.8

07 Oct 2021, 01:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2021-10-07 01:15

Updated : 2024-02-04 22:08

NVD link : CVE-2021-26556

Mitre link : CVE-2021-26556

CVE.ORG link : CVE-2021-26556

JSON object : View

Products Affected

octopus

octopus_deploy
octopus_server

CWE

CWE-426

Untrusted Search Path

{"id": "CVE-2021-26556", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.4, "accessVector": "LOCAL", "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 3.4, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2021-10-07T01:15:07.010", "references": [{"url": "https://advisories.octopus.com/adv/2021-01---Local-privilege-escalation-in-Octopus-Server-%28CVE-2021-26556%29.1733296189.html", "source": "security@octopus.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-426"}]}], "descriptions": [{"lang": "en", "value": "When Octopus Server is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access."}, {"lang": "es", "value": "Cuando Octopus Server se instala usando una ubicaci\u00f3n de carpeta personalizada, las ACL de carpeta no se establecen correctamente y podr\u00edan conllevar a que un usuario no privilegiado use una carga lateral de DLL para conseguir acceso privilegiado"}], "lastModified": "2023-11-07T03:31:45.660", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:octopus:octopus_deploy:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BB1A49F9-06B0-435A-9A46-4BF727C4DE03", "versionEndExcluding": "2020.4.229", "versionStartIncluding": "0.9"}, {"criteria": "cpe:2.3:a:octopus:octopus_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EF275C0A-3A31-4751-9C65-CEC4B22CB6EC", "versionEndExcluding": "2020.5.256", "versionStartIncluding": "2020.5.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@octopus.com"}