WordPress up to 4.7.0 Multisite API ms-functions.php cryptographic issue

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in WordPress. Impacted is an unknown function of the file wp-includes/ms-functions.php of the component Multisite API. This manipulation causes cryptographic issue. This vulnerability appears as CVE-2017-5493. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in WordPress (Content Management System). It has been declared as critical. Affected by this vulnerability is some unknown processing of the file wp-includes/ms-functions.php of the component Multisite API. The manipulation with an unknown input leads to a cryptographic issue vulnerability. The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

wp-includes/ms-functions.php in the Multisite WordPress API in WordPress before 4.7.1 does not properly choose random numbers for keys, which makes it easier for remote attackers to bypass intended access restrictions via a crafted (1) site signup or (2) user signup.

The bug was discovered 01/11/2017. The weakness was presented 01/15/2017 (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2017-5493 since 01/14/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1600 for this issue.

By approaching the search of inurl:wp-includes/ms-functions.php it is possible to find vulnerable targets with Google Hacking. The vulnerability scanner Nessus provides a plugin with the ID 96606 (WordPress < 4.7.1 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175955 (Debian Security Update for wordpress (DSA 3779-1)).

Upgrading to version 3.7.17, 3.8.17, 3.9.15, 4.0.14, 4.1.14, 4.2.11, 4.3.7, 4.4.6, 4.5.5, 4.6.2 or 4.7.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (96606) and SecurityFocus (BID 95401†). See VDB-95347, VDB-95348, VDB-95349 and VDB-95350 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Cryptographic issue
CWE: CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍
Google Hack: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 96606
Nessus Name: WordPress < 4.7.1 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703779
OpenVAS Name: Debian Security Advisory DSA 3779-1 (wordpress - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: WordPress 3.7.17/3.8.17/3.9.15/4.0.14/4.1.14/4.2.11/4.3.7/4.4.6/4.5.5/4.6.2/4.7.1
Patch: github.com

Timelineinfo

01/11/2017 🔍
01/11/2017 +0 days 🔍
01/12/2017 +1 days 🔍
01/14/2017 +2 days 🔍
01/14/2017 +0 days 🔍
01/15/2017 +1 days 🔍
01/15/2017 +0 days 🔍
01/18/2017 +3 days 🔍
05/13/2026 +3402 days 🔍

Sourcesinfo

Product: wordpress.com

Advisory: cea9e2dc62abf777e06b12ec4ad9d1aaa49b29f4
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-5493 (🔍)
GCVE (CVE): GCVE-0-2017-5493
GCVE (VulDB): GCVE-100-95353

OVAL: 🔍

SecurityFocus: 95401 - WordPress Cryptographic Security Bypass Vulnerability
SecurityTracker: 1037591

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 01/15/2017 10:40
Updated: 05/13/2026 13:34
Changes: 01/15/2017 10:40 (79), 06/08/2020 09:02 (3), 11/01/2022 07:26 (6), 11/01/2022 07:32 (1), 05/13/2026 13:34 (21)
Complete: 🔍
Cache ID: 216::103

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

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