CVE-2020-8289

Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from improper certificate validation in `bztransmit` helper due to hardcoded whitelist of strings in URLs where validation is disabled leading to possible remote code execution via client update functionality.

CVSS v3.0 7.8 HIGH
CVSS v2.0 9.3 HIGH

7.8^/10

CVSS v3.0 : 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

9.3^/10

CVSS v2.0 : HIGH

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

Exploitability : 8.6 / Impact : 10.0

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://github.com/geffner/CVE-2020-8289/blob/master/README.md	Exploit Third Party Advisory
https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/	Third Party Advisory
https://youtu.be/W0THXbcX5V8	Exploit Third Party Advisory
https://hackerone.com/reports/818853	Permissions Required
http://seclists.org/fulldisclosure/2020/Dec/58	Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2020/Dec/57	Mailing List Third Party Advisory

Advertisement

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:backblaze:backblaze::::::windows::*
	cpe:2.3:a:backblaze:backblaze::::::macos::*

Information

Published : 2020-12-26 18:15

Updated : 2020-12-31 11:04

NVD link : CVE-2020-8289

Mitre link : CVE-2020-8289

JSON object : View

CWE

CWE-295

Improper Certificate Validation

Advertisement

Products Affected

backblaze

backblaze

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://github.com/geffner/CVE-2020-8289/blob/master/README.md", "name": "https://github.com/geffner/CVE-2020-8289/blob/master/README.md", "tags": ["Exploit", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/", "name": "https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/", "tags": ["Third Party Advisory"], "refsource": "MISC"}, {"url": "https://youtu.be/W0THXbcX5V8", "name": "https://youtu.be/W0THXbcX5V8", "tags": ["Exploit", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://hackerone.com/reports/818853", "name": "https://hackerone.com/reports/818853", "tags": ["Permissions Required"], "refsource": "MISC"}, {"url": "http://seclists.org/fulldisclosure/2020/Dec/58", "name": "20201229 Re: CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "FULLDISC"}, {"url": "http://seclists.org/fulldisclosure/2020/Dec/57", "name": "20201229 Re: [FD] CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "FULLDISC"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from improper certificate validation in `bztransmit` helper due to hardcoded whitelist of strings in URLs where validation is disabled leading to possible remote code execution via client update functionality."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-295"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2020-8289", "ASSIGNER": "cve-assignments@hackerone.com"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 9.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "MEDIUM", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "severity": "HIGH", "acInsufInfo": false, "impactScore": 10.0, "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}, "baseMetricV3": {"cvssV3": {"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}}, "publishedDate": "2020-12-27T02:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:backblaze:backblaze:*:*:*:*:*:windows:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "7.0.1.433"}, {"cpe23Uri": "cpe:2.3:a:backblaze:backblaze:*:*:*:*:*:macos:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "7.0.1.434"}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2020-12-31T19:04Z"}