Use defusedxml for Parsing XML
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| root = defusedxml.ElementTree.fromstring(content) | ||
| if root.tag == xml_response_tag and root.text: | ||
| return root.text |
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The code is using defusedxml.ElementTree.fromstring(content) to parse XML content without any apparent validation of the content before parsing. This could potentially lead to XML External Entity (XXE) attacks if the content includes malicious external entities. Although defusedxml is designed to mitigate such attacks, it is still good practice to validate or sanitize the input before parsing to ensure that the content is trusted. Recommended solution is to implement proper content validation before parsing the XML.
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Micro-Learning Topic: External entity injection (Detected by phrase)
Matched on "XXE"
An XML External Entity attack is a type of attack against an application that parses XML input. This attack occurs when XML input containing a reference to an external entity is processed by a weakly configured XML parser. This attack may lead to the disclosure of confidential data, denial of service, server-side request forgery, port scanning from the perspective of the machine where the parser is located, and other system impacts.
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Helpful references
- OWASP XML External Entity (XXE) Processing - OWASP community page with comprehensive information about XML external entity attacks, and links to various OWASP resources to help detect or prevent it.
- MSDN Security Briefs - XML Denial of Service Attacks and Defenses - An MSDN Magazine article that goes into detail on XML entity attacks and how to defend against them.
- OWASP XML External Entity Prevention Cheat Sheet - This article is focused on providing clear, simple, actionable guidance for preventing XML external entity flaws in your applications.
| root = defusedxml.ElementTree.fromstring(content) | ||
| dirs = self._next_dir_gen(root) | ||
| files = self._next_file_gen(root) | ||
| next_file = files.next() |
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The method files.next() is used, which is not compatible with Python 3. In Python 3, next() is a built-in function and should be used as next(files). This code will raise an AttributeError in Python 3. The recommended solution is to update the code to use the built-in next() function to ensure compatibility with Python 3.
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Thanks @pixeebot[bot] for opening this PR! For COLLABORATOR only :
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PR Details of @pixeebot[bot] in blablastar :
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Description
This pull request modifies the cloudstorage_api.py file. Here are the changes:
defusedxml.ElementTreein line 20.xml.etree.cElementTreein line 35.ET.fromstring(content)withdefusedxml.ElementTree.fromstring(content)in lines 45, 61, and 78.ET.iterparse(result, events=('end',))withdefusedxml.ElementTree.iterparse(result, events=('end',))in line 89.These changes were made to ensure that the XML parsing in the cloud storage API is done safely and securely, without any potential vulnerabilities.