CVE-2018-1000164 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Severity

50%

Complexity

99%

Confidentiality

48%

gunicorn version 19.4.5 contains a CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers vulnerability in "process_headers" function in "gunicorn/http/wsgi.py" that can result in an attacker causing the server to return arbitrary HTTP headers. This vulnerability appears to have been fixed in 19.5.0.

gunicorn version 19.4.5 contains a CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers vulnerability in "process_headers" function in "gunicorn/http/wsgi.py" that can result in an attacker causing the server to return arbitrary HTTP headers. This vulnerability appears to have been fixed in 19.5.0.

CVSS 3.0 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).

CVSS 2.0 Base Score 5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N).

Demo Examples

Improper Neutralization of CRLF Sequences ('CRLF Injection')

CWE-93

If user input data that eventually makes it to a log message isn't checked for CRLF characters, it may be possible for an attacker to forge entries in a log file.


               
logger.info("User's street address: " + request.getParameter("streetAddress"));

Overview

First reported 6 years ago

2018-04-18 19:29:00

Last updated 5 years ago

2019-06-19 22:15:00

Affected Software

Gunicorn 19.4.5

19.4.5

Debian Linux 7.0

7.0

Debian Linux 8.0 (Jessie)

8.0

References

https://epadillas.github.io/2018/04/02/http-header-splitting-in-gunicorn-19.4.5

Exploit, Third Party Advisory

https://github.com/benoitc/gunicorn/issues/1227

Exploit, Issue Tracking, Third Party Advisory

[debian-lts-announce] 20180422 [SECURITY] [DLA 1357-1] gunicorn security update

Third Party Advisory

USN-4022-1

DSA-4186

Third Party Advisory

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