HTTP Header Injection (follow-up of CVE-2016-5699)¶
HTTP Header Injection, follow-up of CVE-2016-5699.
The fix disallows control chars in HTTP URLs.
This change broke applications sending invalid HTTP requests on purpose:
bpo-36274 added private methods
to the http.client.HTTPConnection class (_encode_request() and
_validate_path()) which can be overriden in a subclass for that.
Note: Python 2 urllib.urlopen(url) always quotes the URL and so is not
vulnerable to HTTP Header Injection.
- Disclosure date: 2017-05-24 (Python issue bpo-30458 reported)
Fixed In¶
- Python 2.7.17 (2019-10-19) fixed by commit bb8071a (branch 2.7) (2019-05-21)
- Python 3.5.8 (2019-10-29) fixed by commit afe3a49 (branch 3.5) (2019-07-14)
- Python 3.6.9 (2019-07-03) fixed by commit c50d437 (branch 3.6) (2019-05-08)
- Python 3.7.4 (2019-07-09) fixed by commit 7e200e0 (branch 3.7) (2019-05-07)
- Python 3.8.0 (2019-10-14) fixed by commit c4e671e (branch 3.8) (2019-05-01)
Python issue¶
[security][CVE-2019-9740][CVE-2019-9947] HTTP Header Injection (follow-up of CVE-2016-5699).
- Python issue: bpo-30458
- Creation date: 2017-05-24
- Reporter: Orange
CVE-2019-9740¶
An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with rn (specifically in the query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.
- CVE ID: CVE-2019-9740
- Published: 2019-03-13
- CVSS Score: 4.3
CVE-2019-9947¶
An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with rn (specifically in the path component of a URL that lacks a ? character) followed by an HTTP header or a Redis command. This is similar to the CVE-2019-9740 query string issue. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.
- CVE ID: CVE-2019-9947
- Published: 2019-03-23
- CVSS Score: 4.3
Timeline¶
Timeline using the disclosure date 2017-05-24 as reference:
- 2017-05-24: Python issue bpo-30458 reported by Orange
- 2019-03-13 (+658 days): CVE-2019-9740 published
- 2019-03-23 (+668 days): CVE-2019-9947 published
- 2019-05-01 (+707 days): commit c4e671e (branch 3.8)
- 2019-05-07 (+713 days): commit 7e200e0 (branch 3.7)
- 2019-05-08 (+714 days): commit c50d437 (branch 3.6)
- 2019-05-21 (+727 days): commit bb8071a (branch 2.7)
- 2019-07-03 (+770 days): Python 3.6.9 released
- 2019-07-09 (+776 days): Python 3.7.4 released
- 2019-07-14 (+781 days): commit afe3a49 (branch 3.5)
- 2019-10-14: Python 3.8.0 released
- 2019-10-19 (+878 days): Python 2.7.17 released
- 2019-10-29 (+888 days): Python 3.5.8 released