CVE-2023-49277: Dpaste Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-r8j9-5cj7-cv39
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2023-49277 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Dpaste libraries in the PyPI ecosystem. The issue involves reflected xss vulnerability in dpaste. Remediation is available by upgrading affected packages to version 3.8.

CVE-2023-49277 at a Glance

CVE Identifier CVE-2023-49277
GHSA Identifier GHSA-r8j9-5cj7-cv39
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 Dpaste
Package Ecosystem PyPI
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:3.1/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-2023-49277

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

Dpaste fixed: 3.8 
pip install Dpaste>=3.8
Verify Direct and Transitive Dependencies

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

pip show Dpaste

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2023-49277, inspect your installed packages using pip:

pip show Dpaste

Analyze the terminal output to locate any version of Dpaste in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.8), your application is affected.

Note: The pip show Dpaste command checks currently installed packages in your active Python environment.

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 Dpaste, 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

### Impact A security vulnerability has been identified in the expires parameter of the dpaste API, allowing for a POST Reflected XSS attack. This vulnerability can be exploited by an attacker to execute arbitrary JavaScript code in the context of a user's browser, potentially leading to unauthorized access, data theft, or other malicious activities. ### Patches - A patch has been applied to the dpaste GitHub repository to address the specific content value injection vulnerability. - Users are strongly advised to upgrade to dpaste release v3.8 or later versions, as dpaste versions older than v3.8 are susceptible to the identified security vulnerability. - The patch can be viewed and applied from the following link: [dpaste Commit Patch](https://github.com/DarrenOfficial/dpaste/commit/44a666a79b3b29ed4f340600bfcf55113bfb7086.patch) ### Workarounds At this time, the recommended course of action is to apply the provided patch to the affected systems. No known workarounds have been identified, and applying the patch is the most effective way to remediate the vulnerability.

CVE-2023-49277 Affected Dpaste Versions

1 component(s)
Fixed Versions:
3.8
Product / Package Ecosystem Affected Versions Fixed Version
Dpaste
pypi/Dpaste
PyPI
< 3.8
3.8

References

GitHub Advisory / Wiki ADVISORY
https://github.com/DarrenOfficial/dpaste/security/advisories/GHSA-r8j9-5cj7-cv39
NVD — CVE-2023-49277 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-49277
Security Fix Commit FIX COMMIT
https://github.com/DarrenOfficial/dpaste/commit/44a666a79b3b29ed4f340600bfcf55113bfb7086
Dpaste Source Repository REPOSITORY
https://github.com/DarrenOfficial/dpaste

Frequently Asked Questions

What is CVE-2023-49277?
CVE-2023-49277 is a security vulnerability in Dpaste involving Reflected XSS Vulnerability in dpaste under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Dpaste versions are affected?
Affected versions include releases prior to 3.8 across affected packages: Dpaste.
What version fixes CVE-2023-49277?
Upgrading to 3.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Dpaste affected?
Yes, Dpaste is affected in releases prior to 3.8. Upgrade your dependency to 3.8 or later.
What is the CVSS score of CVE-2023-49277?
CVE-2023-49277 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2023-49277?
CVE-2023-49277 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 PyPI dependencies for CVE-2023-49277?
Run the dependency tree command: 'pip show Dpaste'. 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-r8j9-5cj7-cv39",
  "modified" : "2023-12-07T22:59:53Z",
  "published" : "2023-12-01T19:23:16Z",
  "aliases" : [ "CVE-2023-49277" ],
  "summary" : "Reflected XSS Vulnerability in dpaste",
  "details" : "### Impact\nA security vulnerability has been identified in the expires parameter of the dpaste API, allowing for a POST Reflected XSS attack. This vulnerability can be exploited by an attacker to execute arbitrary JavaScript code in the context of a user's browser, potentially leading to unauthorized access, data theft, or other malicious activities.\n\n### Patches\n- A patch has been applied to the dpaste GitHub repository to address the specific content value injection vulnerability.\n- Users are strongly advised to upgrade to dpaste release v3.8 or later versions, as dpaste versions older than v3.8 are susceptible to the identified security vulnerability.\n- The patch can be viewed and applied from the following link: [dpaste Commit Patch](https://github.com/DarrenOfficial/dpaste/commit/44a666a79b3b29ed4f340600bfcf55113bfb7086.patch)\n\n### Workarounds\nAt this time, the recommended course of action is to apply the provided patch to the affected systems. No known workarounds have been identified, and applying the patch is the most effective way to remediate the vulnerability.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Dpaste"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/DarrenOfficial/dpaste/security/advisories/GHSA-r8j9-5cj7-cv39"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-49277"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/DarrenOfficial/dpaste/commit/44a666a79b3b29ed4f340600bfcf55113bfb7086"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/DarrenOfficial/dpaste"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-12-01T19:23:16Z",
    "nvd_published_at" : "2023-12-01T21:15:08Z"
  }
}