CVE-2017-7271: Yiisoft/yii2 Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-4xh9-5vh8-3p58
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2017-7271 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Yiisoft/yii2 libraries in the Packagist ecosystem. The issue involves yii framework reflected xss. Remediation is available by upgrading affected packages to version 2.0.11.

CVE-2017-7271 at a Glance

CVE Identifier CVE-2017-7271
GHSA Identifier GHSA-4xh9-5vh8-3p58
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Yiisoft/yii2
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2017-7271

To remediate this vulnerability, upgrade all affected Yiisoft/yii2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

yiisoft/yii2 fixed: 2.0.11 
Upgrade yiisoft/yii2 to 2.0.11
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for yiisoft/yii2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2017-7271, inspect your project dependencies for Yiisoft/yii2:

inspect dependencies for yiisoft/yii2

Analyze the terminal output to locate any version of Yiisoft/yii2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.11), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Yiisoft/yii2, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Reflected Cross-site scripting (XSS) vulnerability in Yii Framework before 2.0.11, when development mode is used, allows remote attackers to inject arbitrary web script or HTML via crafted request data that is mishandled on the debug-mode exception screen.

CVE-2017-7271 Affected Yiisoft/yii2 Versions

1 component(s)
Fixed Versions:
2.0.11
Product / Package Ecosystem Affected Versions Fixed Version
yiisoft/yii2
 Packagist
< 2.0.11
2.0.11

References

NVD — CVE-2017-7271 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-7271
Yiisoft/yii2 Source Repository REPOSITORY
https://github.com/yiisoft/yii2/pull/13401
Security Fix Commit FIX COMMIT
https://github.com/yiisoft/yii2/commit/97171a0db7cda0a49931ee0c3b998ef50bd06756
Yiisoft/yii2 Source Repository REPOSITORY
https://github.com/yiisoft/yii2
Yiisoft/yii2 Security Information SECURITY
https://web.archive.org/web/20210125191138/http://www.securityfocus.com/bid/97167
www.yiiframework.com/news/123/yii-2-0-11... WEB
http://www.yiiframework.com/news/123/yii-2-0-11-is-released

Frequently Asked Questions

What is CVE-2017-7271?
CVE-2017-7271 is a security vulnerability in Yiisoft/yii2 involving Yii Framework Reflected XSS under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Yiisoft/yii2 versions are affected?
Affected versions include releases prior to 2.0.11 across affected packages: yiisoft/yii2.
What version fixes CVE-2017-7271?
Upgrading to 2.0.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is yiisoft/yii2 affected?
Yes, yiisoft/yii2 is affected in releases prior to 2.0.11. Upgrade your dependency to 2.0.11 or later.
What is the CVSS score of CVE-2017-7271?
CVE-2017-7271 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2017-7271?
CVE-2017-7271 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2017-7271?
Run the dependency tree command: 'inspect dependencies for yiisoft/yii2'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4xh9-5vh8-3p58",
  "modified" : "2023-10-31T19:48:28Z",
  "published" : "2022-05-17T02:46:54Z",
  "aliases" : [ "CVE-2017-7271" ],
  "summary" : "Yii Framework Reflected XSS",
  "details" : "Reflected Cross-site scripting (XSS) vulnerability in Yii Framework before 2.0.11, when development mode is used, allows remote attackers to inject arbitrary web script or HTML via crafted request data that is mishandled on the debug-mode exception screen.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "yiisoft/yii2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-7271"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yiisoft/yii2/pull/13401"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yiisoft/yii2/commit/97171a0db7cda0a49931ee0c3b998ef50bd06756"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/yiisoft/yii2"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20210125191138/http://www.securityfocus.com/bid/97167"
  }, {
    "type" : "WEB",
    "url" : "http://www.yiiframework.com/news/123/yii-2-0-11-is-released"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-27T21:12:39Z",
    "nvd_published_at" : "2017-03-27T17:59:00Z"
  }
}