Apache HTTP Server up to 2.2.31/2.4.23 mod_userdir HTTP Response Splitting crlf injection
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
6.4 | $0-$5k | 0.04 |
A vulnerability, which was classified as critical, was found in Apache HTTP Server up to 2.2.31/2.4.23 (Web Server). This affects an unknown code of the component mod_userdir. The manipulation with an unknown input leads to a crlf injection vulnerability (HTTP Response Splitting). CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:
Possible CRLF injection allowing HTTP response splitting attacks for sites which use mod_userdir. This issue was mitigated by changes made in 2.4.25 and 2.2.32 which prohibit CR or LF injection into the "Location" or other outbound header key or value. Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23). Fixed in Apache HTTP Server 2.2.32 (Affected 2.2.0-2.2.31).
The bug was discovered 08/14/2018. The weakness was shared 08/14/2018 (Website). The advisory is shared at httpd.apache.org. This vulnerability is uniquely identified as CVE-2016-4975 since 05/24/2016. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.
The vulnerability scanner Nessus provides a plugin with the ID 112199 (SUSE SLES12 Security Update : apache2 (SUSE-SU-2018:2554-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171497 (SUSE Enterprise Linux Security Update for apache2 (SUSE-SU-2018:2815-1)).
Upgrading to version 2.2.32 or 2.4.25 eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.
The vulnerability is also documented in the vulnerability database at Tenable (112199). The entry 94625 is related to this item.
Product
Type
Vendor
Name
Version
- 2.2.0
- 2.2.1
- 2.2.2
- 2.2.3
- 2.2.4
- 2.2.5
- 2.2.6
- 2.2.7
- 2.2.8
- 2.2.9
- 2.2.10
- 2.2.11
- 2.2.12
- 2.2.13
- 2.2.14
- 2.2.15
- 2.2.16
- 2.2.17
- 2.2.18
- 2.2.19
- 2.2.20
- 2.2.21
- 2.2.22
- 2.2.23
- 2.2.24
- 2.2.25
- 2.2.26
- 2.2.27
- 2.2.28
- 2.2.29
- 2.2.30
- 2.2.31
- 2.4.0
- 2.4.1
- 2.4.2
- 2.4.3
- 2.4.4
- 2.4.5
- 2.4.6
- 2.4.7
- 2.4.8
- 2.4.9
- 2.4.10
- 2.4.11
- 2.4.12
- 2.4.13
- 2.4.14
- 2.4.15
- 2.4.16
- 2.4.17
- 2.4.18
- 2.4.19
- 2.4.20
- 2.4.21
- 2.4.22
- 2.4.23
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
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CVSSv3
VulDB Meta Base Score: 6.7VulDB Meta Temp Score: 6.6
VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 6.1
NVD Vector: 🔍
CVSSv2
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VulDB Base Score: 🔍
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Exploiting
Name: HTTP Response SplittingClass: Crlf injection / HTTP Response Splitting
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
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Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Nessus ID: 112199
Nessus Name: SUSE SLES12 Security Update : apache2 (SUSE-SU-2018:2554-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Upgrade: HTTP Server 2.2.32/2.4.25
Timeline
05/24/2016 🔍08/14/2018 🔍
08/14/2018 🔍
08/14/2018 🔍
08/14/2018 🔍
08/15/2018 🔍
08/30/2018 🔍
08/31/2018 🔍
03/15/2020 🔍
Sources
Vendor: apache.orgAdvisory: httpd.apache.org
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2016-4975 (🔍)
SecurityFocus: 105093 - Apache HTTP Server CVE-2016-4975 HTTP Response Splitting Vulnerability
See also: 🔍
Entry
Created: 08/15/2018 06:39Updated: 03/15/2020 16:11
Changes: 08/15/2018 06:39 (76), 03/15/2020 16:11 (5)
Complete: 🔍
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