CVE-2023-49277

Reflected XSS vulnerability in dpaste API expires parameter

• CVSS 6.1
• CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
• Configuration Issues
• Remote

dpaste is an open source pastebin application written in Python using the Django framework. 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. 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. No known workarounds have been identified, and applying the patch is the most effective way to remediate the vulnerability.

CVE

CVE-2023-49277

CWE

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS base score

6.1

Published

2023-12-01

OWASP

A03 Injection

Orthogonal defect classification

Checking

Code defect classification

Missing Check

Category

Configuration Issues

Subcategory

Cross-Site Scripting (XSS)

Accessibility scope

Remote

Impact

Arbitrary Code Execution

Fixed by upgrading

Yes

Solution

Upgrade to dpaste release v3.8 or later

def create_paste(request):
    if request.method == 'POST':
        expires = request.POST.get('expires', '')
        
        paste = Paste.objects.create(content=request.POST['content'], expires=expires)
        return redirect('paste_detail', paste_id=paste.id)

from django.utils.html import escape

def create_paste(request):
    if request.method == 'POST':
        expires = request.POST.get('expires', '')
        escaped_expires = escape(expires)
        
        paste = Paste.objects.create(content=request.POST['content'], expires=escaped_expires)
        return redirect('paste_detail', paste_id=paste.id)

@misc{vaitp:cve202349277,
  title        = {{Reflected XSS vulnerability in dpaste API expires parameter}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2023},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2023-49277},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2023-49277/}}
}