// For flags

CVE-2019-11236

python-urllib3: CRLF injection due to not encoding the '\r\n' sequence leading to possible attack on internal service

Severity Score

6.1
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In the urllib3 library through 1.24.1 for Python, CRLF injection is possible if the attacker controls the request parameter.

En la librería urllib3, hasta la versión 1.24.1 para Python, se puede realizar una inyección CRLF si el atacante controla el parámetro request.

It was discovered that urllib3 incorrectly removed Authorization HTTP headers when handled cross-origin redirects. This could result in credentials being sent to unintended hosts. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 18.10. It was discovered that urllib3 incorrectly stripped certain characters from requests. A remote attacker could use this issue to perform CRLF injection. Various other issues were also addressed.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-04-15 CVE Reserved
  • 2019-04-15 CVE Published
  • 2024-08-04 CVE Updated
  • 2024-08-04 First Exploit
  • 2025-03-31 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
  • CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CAPEC
References (17)
URL Tag Source
https://lists.debian.org/debian-lts-announce/2019/06/msg00016.html Mailing List
https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html Mailing List
https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html Mailing List
URL Date SRC
https://github.com/urllib3/urllib3/issues/1553 2024-08-04
URL Date SRC
URL Date SRC
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html 2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00041.html 2023-11-07
https://access.redhat.com/errata/RHSA-2019:2272 2023-11-07
https://access.redhat.com/errata/RHSA-2019:3335 2023-11-07
https://access.redhat.com/errata/RHSA-2019:3590 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NKGPJLVLVYCL4L4B4G5TIOTVK4BKPG72 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R62XGEYPUTXMRHGX5I37EBCGQ5COHGKR 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TBI45HO533KYHNB5YRO43TBYKA3E3VRL 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOSA2NT4DUQDBEIWE6O7KKD24XND7TE2 2023-11-07
https://usn.ubuntu.com/3990-1 2023-11-07
https://usn.ubuntu.com/3990-2 2023-11-07
https://access.redhat.com/security/cve/CVE-2019-11236 2020-05-12
https://bugzilla.redhat.com/show_bug.cgi?id=1700824 2020-05-12
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Python
Search vendor "Python"
 Urllib3
Search vendor "Python" for product "Urllib3"
 <= 1.24.2
Search vendor "Python" for product "Urllib3" and version " <= 1.24.2"
-
Affected