Medium · published March 13, 2019
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 \r\n (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.
| Product | Versions | Fixed in |
|---|---|---|
| python/python | ≥ 2.0, < 2.7.17 | 2.7.17 |
| python/python | ≥ 3.5.0, < 3.5.8 | 3.5.8 |
| python/python | ≥ 3.6.0, < 3.6.9 | 3.6.9 |
| python/python | ≥ 3.7.0, < 3.7.4 | 3.7.4 |