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GitHub_MCVE-2021-39222

HistoryNov 15, 2021 - 7:15 p.m.

CVE-2021-39222

2021-11-1519:15:07

CWE-434

CWE-79

GitHub_M

web.nvd.nist.gov

nextcloud

talk

xss

vulnerability

patch

content-security-policy

nextcloud talk application security fix

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

6.4

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

EPSS

0.001

Percentile

34.0%

JSON

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Talk application was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Talk application is upgraded to patched versions 10.0.7, 10.1.4, 11.1.2, 11.2.0 or 12.0.0. As a workaround, use a browser that has support for Content-Security-Policy.

Affected configurations

Nvd

Vulners

Node

nextcloudtalkRange<10.0.7

nextcloudtalkRange10.1.0–10.1.4

nextcloudtalkRange11.0.0–11.1.2

VendorProductVersionCPE
nextcloudtalk*cpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
nextcloud	talk	*	cpe:2.3:a:nextcloud:talk::::::::

CNA Affected

[
  {
    "product": "security-advisories",
    "vendor": "nextcloud",
    "versions": [
      {
        "status": "affected",
        "version": "< 10.0.7"
      },
      {
        "status": "affected",
        "version": ">= 10.1.0, < 10.1.4"
      },
      {
        "status": "affected",
        "version": ">= 11.1.0, < 11.1.2"
      },
      {
        "status": "affected",
        "version": "< 11.2.0"
      },
      {
        "status": "affected",
        "version": ">= 12.0.0.alpha-1, < 12.0.0"
      }
    ]
  }
]

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-f4vg-jw5g

github.com/nextcloud/spreed/pull/542

hackerone.com/reports/1135481

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

6.4

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

EPSS

0.001

Percentile

34.0%

JSON

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