Vulnerability-Lookup

CNVD-2020-18983

Vulnerability from cnvd - Published: 2020-03-24

Title

Avast Secure Browser本地权限提升漏洞

Description

Avast Secure Browser是一款专为隐私而构建的全新的浏览器。 Avast Secure Browser 76.0.1659.101版本中存在安全漏洞，该漏洞源于AvastBrowserUpdate.exe文件所设置的ACL并不安全。攻击者可通过在\\%PROGRAMDATA\\%Avast SoftwareBrowserUpdate目录下创建名称为Update.ini的硬链接利用该漏洞获得权限。

Severity

高

Formal description

目前厂商暂未发布修复措施解决此安全问题，建议使用此软件的用户随时关注厂商主页或参考网址以获取解决办法： https://www.avast.com/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2019-17190

Impacted products

Name
Avast Secure Browser 76.0.1659.101

Show details on source website

JSON

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  "cves": {
    "cve": {
      "cveNumber": "CVE-2019-17190"
    }
  },
  "description": "Avast Secure Browser\u662f\u4e00\u6b3e\u4e13\u4e3a\u9690\u79c1\u800c\u6784\u5efa\u7684\u5168\u65b0\u7684\u6d4f\u89c8\u5668\u3002\n\nAvast Secure Browser 76.0.1659.101\u7248\u672c\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eAvastBrowserUpdate.exe\u6587\u4ef6\u6240\u8bbe\u7f6e\u7684ACL\u5e76\u4e0d\u5b89\u5168\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u5728\\\\%PROGRAMDATA\\\\%Avast SoftwareBrowserUpdate\u76ee\u5f55\u4e0b\u521b\u5efa\u540d\u79f0\u4e3aUpdate.ini\u7684\u786c\u94fe\u63a5\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u5f97\u6743\u9650\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u6682\u672a\u53d1\u5e03\u4fee\u590d\u63aa\u65bd\u89e3\u51b3\u6b64\u5b89\u5168\u95ee\u9898\uff0c\u5efa\u8bae\u4f7f\u7528\u6b64\u8f6f\u4ef6\u7684\u7528\u6237\u968f\u65f6\u5173\u6ce8\u5382\u5546\u4e3b\u9875\u6216\u53c2\u8003\u7f51\u5740\u4ee5\u83b7\u53d6\u89e3\u51b3\u529e\u6cd5\uff1a\r\nhttps://www.avast.com/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-18983",
  "openTime": "2020-03-24",
  "products": {
    "product": "Avast Secure Browser 76.0.1659.101"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2019-17190",
  "serverity": "\u9ad8",
  "submitTime": "2020-03-23",
  "title": "Avast Secure Browser\u672c\u5730\u6743\u9650\u63d0\u5347\u6f0f\u6d1e"
}

CVE-2019-17190 (GCVE-0-2019-17190)

Vulnerability from cvelistv5 – Published: 2020-01-27 15:23 – Updated: 2024-08-05 01:33

Summary

A Local Privilege Escalation issue was discovered in Avast Secure Browser 76.0.1659.101. The vulnerability is due to an insecure ACL set by the AvastBrowserUpdate.exe (which is running as NT AUTHORITY\SYSTEM) when AvastSecureBrowser.exe checks for new updates. When the update check is triggered, the elevated process cleans the ACL of the Update.ini file in %PROGRAMDATA%\Avast Software\Browser\Update\ and sets all privileges to group Everyone. Because any low-privileged user can create, delete, or modify the Update.ini file stored in this location, an attacker with low privileges can create a hard link named Update.ini in this folder, and make it point to a file writable by NT AUTHORITY\SYSTEM. Once AvastBrowserUpdate.exe is triggered by the update check functionality, the DACL is set to a misconfigured value on the crafted Update.ini and, consequently, to the target file that was previously not writable by the low-privileged attacker.

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

	https://www.avast.com/bug-bounty-credits/en/a-tri…	x_refsource_MISC
	http://seclists.org/fulldisclosure/2020/Mar/25	mailing-listx_refsource_FULLDISC
	http://packetstormsecurity.com/files/156844/Avast…	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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            "url": "https://www.avast.com/bug-bounty-credits/en/a-tribute-to-our-security-research-community"
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CNVD-2020-18983

CVE-2019-17190 (GCVE-0-2019-17190)

Tags

Sightings

Nomenclature