Apache HTTP Server up to 2.4.29 mod_session HTTP_SESSION input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Apache HTTP Server up to 2.4.29. It has been classified as critical. This affects an unknown function of the component mod_session. This manipulation of the argument HTTP_SESSION as part of Variable Name causes input validation. This vulnerability is tracked as CVE-2018-1283. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Apache HTTP Server up to 2.4.29 (Web Server). Affected by this vulnerability is an unknown code block of the component mod_session. The manipulation of the argument HTTP_SESSION as part of a Variable Name leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In Apache httpd 2.4.0 to 2.4.29, when mod_session is configured to forward its session data to CGI applications (SessionEnv on, not the default), a remote user may influence their content by using a "Session" header. This comes from the "HTTP_SESSION" variable name used by mod_session to forward its data to CGIs, since the prefix "HTTP_" is also used by the Apache HTTP Server to pass HTTP header fields, per CGI specifications.

The bug was discovered 03/21/2018. The weakness was disclosed 03/26/2018 (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2018-1283 since 12/07/2017. The attack can be launched remotely. The requirement for exploitation is a single authentication. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 109598 (SUSE SLES12 Security Update : apache2 (SUSE-SU-2018:1161-1)), 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 197112 (Ubuntu Security Notification for Apache2 Vulnerabilities (USN-3627-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109598) and SecurityFocus (BID 103520†). The entries VDB-103521, VDB-108939, VDB-115038 and VDB-115039 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.8
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 109598
Nessus Name: SUSE SLES12 Security Update : apache2 (SUSE-SU-2018:1161-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 866622
OpenVAS Name: Debian Security Advisory DSA 4164-1 (apache2 - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

12/07/2017 🔍
03/21/2018 +104 days 🔍
03/21/2018 +0 days 🔍
03/26/2018 +5 days 🔍
03/26/2018 +0 days 🔍
03/27/2018 +1 days 🔍
05/07/2018 +41 days 🔍
05/08/2018 +1 days 🔍
02/24/2023 +1753 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: RHSA-2018:3558
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-1283 (🔍)
GCVE (CVE): GCVE-0-2018-1283
GCVE (VulDB): GCVE-100-115057

OVAL: 🔍

SecurityFocus: 103520 - Apache HTTP Server CVE-2018-1283 Remote Security Vulnerability
SecurityTracker: 1040568

See also: 🔍

Entryinfo

Created: 03/27/2018 09:17
Updated: 02/24/2023 10:08
Changes: 03/27/2018 09:17 (79), 01/16/2020 20:00 (5), 02/06/2021 08:26 (2), 02/24/2023 10:08 (3)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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