Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS14Yzh4LXZwNzktcDN3bc4AA2sO

twisted.web has disordered HTTP pipeline response

Twisted is an event-based framework for internet applications. Prior to version 23.10.0rc1, when sending multiple HTTP requests in one TCP packet, twisted.web will process the requests asynchronously without guaranteeing the response order. If one of the endpoints is controlled by an attacker, the attacker can delay the response on purpose to manipulate the response of the second request when a victim launched two requests using HTTP pipeline. Version 23.10.0rc1 contains a patch for this issue.

Details

There's an example faulty program:

from twisted.internet import reactor, endpoints
from twisted.web import server
from twisted.web.proxy import ReverseProxyResource
from twisted.web.resource import Resource

class Second(Resource):
    isLeaf = True
    def render_GET(self, request):
        return b'SECOND\n'

class First(Resource):
    isLeaf = True
    def render_GET(self, request):
        def send_response():
            request.write(b'FIRST DELAYED\n')
            request.finish()
        reactor.callLater(0.5, send_response)
        return server.NOT_DONE_YET

root = Resource()

root.putChild(b'second', Second())
root.putChild(b'first', First())

endpoint = endpoints.TCP4ServerEndpoint(reactor, 8080)
endpoint.listen(server.Site(root))
reactor.run()

When two requests for /first and /second are sent in the same order, the second request will be responded to first.

echo -en "GET /first HTTP/1.1\r\nHost: a\r\n\r\nGET /second HTTP/1.1\r\nHost: a\r\n\r\n" | nc localhost 8080

Permalink: https://github.com/advisories/GHSA-xc8x-vp79-p3wm
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS14Yzh4LXZwNzktcDN3bc4AA2sO
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 1 year ago
Updated: about 1 month ago

CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Percentage: 0.00067
EPSS Percentile: 0.31354

Identifiers: GHSA-xc8x-vp79-p3wm, CVE-2023-46137
References:

• https://github.com/twisted/twisted/security/advisories/GHSA-xc8x-vp79-p3wm
• https://nvd.nist.gov/vuln/detail/CVE-2023-46137
• https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2023-224.yaml
• https://github.com/advisories/GHSA-xc8x-vp79-p3wm

Repository: https://github.com/twisted/twisted
Blast Radius: 20.8

Affected Packages