CVE-2017-5493 : wp-includes/ms-functions.php in the Multisite WordPress API in WordPress before

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.

Published 2017-01-15 02:59:03

Updated 2019-10-03 00:03:26

Source MITRE

View at NVD, CVE.org

Products affected by CVE-2017-5493

Wordpress » Wordpress
Versions up to, including, (<=) 4.7
cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2017-5493

Top countries where our scanners detected CVE-2017-5493

Top open port discovered on systems with this issue 80

IPs affected by CVE-2017-5493 8,449

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2017-5493!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2017-5493

EPSS FAQ

1.67%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 81 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2017-5493

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:P/A:N	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
7.5	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: None

CWE ids for CVE-2017-5493

CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-5493

https://wordpress.org/news/2017/01/wordpress-4-7-1-security-and-maintenance-release/

News – WordPress 4.7.1 Security and Maintenance Release – WordPress.org
Vendor Advisory

CVEs referencing this url
http://www.securitytracker.com/id/1037591

WordPress Bugs Let Remote Users Conduct Cross-Site Scripting and Cross-Site Request Forgery Attacks and Obtain Potentially Sensitive Information - SecurityTracker

CVEs referencing this url
https://wpvulndb.com/vulnerabilities/8721

WordPress 3.0-4.7 - Cryptographically Weak Pseudo-Random Number Generator (PRNG)
http://www.securityfocus.com/bid/95401

WordPress Cryptographic Security Bypass Vulnerability
http://www.openwall.com/lists/oss-security/2017/01/14/6

oss-security - Re: CVE Request: Wordpress: 8 security issues in 4.7
Mailing List;Third Party Advisory

CVEs referencing this url
http://www.debian.org/security/2017/dsa-3779

Debian -- Security Information -- DSA-3779-1 wordpress

CVEs referencing this url
https://codex.wordpress.org/Version_4.7.1

Version 4.7.1 | WordPress.org
Release Notes;Vendor Advisory

CVEs referencing this url
https://github.com/WordPress/WordPress/commit/cea9e2dc62abf777e06b12ec4ad9d1aaa49b29f4

Multisite: Use `wp_rand()` in signup key creation. · WordPress/WordPress@cea9e2d · GitHub
Patch