CVE-2020-11078Medium· 6.8▾ SunlitCRLF injection in httplib2
▾ Sunlit zone — Low / medium · no exploitation signal
impact 37.4 · likelihood 0.5 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
2.6%
Attacker controlling unescaped part of uri for httplib2.Http.request() could change request headers and body, send additional hidden requests to same server.
Impacts software that uses httplib2 with uri constructed by string concatenation, as opposed to proper urllib building with escaping.
Problem has been fixed in 0.18.0 Space, CR, LF characters are now quoted before any use. This solution should not impact any valid usage of httplib2 library, that is uri constructed by urllib.
Create URI with urllib.parse family functions: urlencode, urlunsplit.
user_input = " HTTP/1.1\r\ninjected: attack\r\nignore-http:"
-uri = "https://api.server/?q={}".format(user_input)
+uri = urllib.parse.urlunsplit(("https", "api.server", "/v1", urllib.parse.urlencode({"q": user_input}), ""))
http.request(uri)
https://cwe.mitre.org/data/definitions/93.html https://docs.python.org/3/library/urllib.parse.html
Thanks to Recar https://github.com/Ciyfly for finding vulnerability and discrete notification.
If you have any questions or comments about this advisory:
httplib2 < 0.18.0Upgrade to a patched release:
httplib2 0.18.0Connected by shared product, vendor, weakness, or advisory.