WordPress before 5.5.2 allows XSS associated with global variables.

**WordPress 5.5.3 Maintenance Release**

This maintenance release fixes an issue introduced in WordPress 5.5.2 which makes it impossible to install WordPress on a brand new website that does not have a database connection configured.

----

**WordPress 5.5.2 Security and Maintenance Release**

**Security Updates**

  - Props to Alex Concha of the WordPress Security Team for     their work in hardening deserialization requests.

  - Props to David Binovec on a fix to disable spam embeds     from disabled sites on a multisite network.

  - Thanks to Marc Montas from Sucuri for reporting an issue     that could lead to XSS from global variables.

  - Thanks to Justin Tran who reported an issue surrounding     privilege escalation in XML-RPC. He also found and     disclosed an issue around privilege escalation around     post commenting via XML-RPC.

  - Props to Omar Ganiev who reported a method where a DoS     attack could lead to RCE.

  - Thanks to Karim El Ouerghemmi from RIPS who disclosed a     method to store XSS in post slugs.

  - Thanks to Slavco for reporting, and confirmation from     Karim El Ouerghemmi, a method to bypass protected meta     that could lead to arbitrary file deletion.

  - Thanks to Erwan LR from WPScan who responsibly disclosed     a method that could lead to CSRF.

  - And a special thanks to @zieladam who was integral in     many of the releases and patches during this release.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its self-reported version number, the detected WordPress application is affected by multiple vulnerabilities :

 - A deserialization vulnerability exists in Requests_Utility_FilteredIterator class.

 - A cross-site scripting (XSS) vulnerability exists via global variables and post slugs.

 - A denial of service vulnerability against the MySQL database.

 - Two privilege escalation vulnerabilities in XML-RPC.

 - An arbitrary file deletion vulnerability exists via a bypass of protected meta.

 - A cross-site request forgery (CSRF) vulnerability exists when updating a background image.

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

Several vulnerabilities were discovered in Wordpress, a web blogging tool. They allowed remote attackers to run insecure deserialization, embed spam, perform various Cross-Site Scripting (XSS) or Cross-Site Request Forgery (CSRF) attacks, escalate privileges, run arbitrary code, and delete arbitrary files.

There were several vulnerabilites reported against wordpress, as follows :

CVE-2020-28032

WordPress before 4.7.19 mishandles deserialization requests in wp-includes/Requests/Utility/FilteredIterator.php.

CVE-2020-28033

WordPress before 4.7.19 mishandles embeds from disabled sites on a multisite network, as demonstrated by allowing a spam embed.

CVE-2020-28034

WordPress before 4.7.19 allows XSS associated with global variables.

CVE-2020-28035

WordPress before 4.7.19 allows attackers to gain privileges via XML-RPC.

CVE-2020-28036

wp-includes/class-wp-xmlrpc-server.php in WordPress before 4.7.19 allows attackers to gain privileges by using XML-RPC to comment on a post.

CVE-2020-28037

is_blog_installed in wp-includes/functions.php in WordPress before 4.7.19 improperly determines whether WordPress is already installed, which might allow an attacker to perform a new installation, leading to remote code execution (as well as a denial of service for the old installation).

CVE-2020-28038

WordPress before 4.7.19 allows stored XSS via post slugs.

CVE-2020-28039

is_protected_meta in wp-includes/meta.php in WordPress before 4.7.19 allows arbitrary file deletion because it does not properly determine whether a meta key is considered protected.

CVE-2020-28040

WordPress before 4.7.19 allows CSRF attacks that change a theme's background image.

For Debian 9 stretch, these problems have been fixed in version 4.7.19+dfsg-1+deb9u1.

We recommend that you upgrade your wordpress packages.

For the detailed security status of wordpress please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/wordpress

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its self-reported version number, the installation of WordPress installed on the remote host is affected by multiple vulnerabilities: 

  - A deserialization vulnerability exists in wp-includes/Requests/Utility/FilteredIterator.php. An   unauthenticated, remote attacker can exploit this, by sending specially crafted serialized payloads   to an affected instance, to execute arbitrary code on the target host (CVE-2020-28032).

  - Multiple privilege escalation vulnerabilities exist in the XML-RPC component of Wordpress. An   unauthenticated, remote attacker can exploit these, to gain privileged access to an affected   host (CVE-2020-28035, CVE-2020-28036).

  - A remote code execution vulnerability exists in the is_blog_installed function of   wp-includes/functions.php. An unauthenticated, remote attacker can exploit this to bypass authentication   and execute arbitrary commands (CVE-2020-28037).    Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version

ID	Name	Product	Family	Severity
142857	Fedora 31 : wordpress (2020-15e15c35da)	Nessus	Fedora Local Security Checks	critical
142851	Fedora 32 : wordpress (2020-b386fac43a)	Nessus	Fedora Local Security Checks	critical
142830	Fedora 33 : wordpress (2020-a764b11b52)	Nessus	Fedora Local Security Checks	critical
112649	WordPress 5.5.x < 5.5.2 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112648	WordPress 5.4.x < 5.4.3 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112647	WordPress 5.3.x < 5.3.5 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112646	WordPress 5.2.x < 5.2.8 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112645	WordPress 5.1.x < 5.1.7 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112644	WordPress 5.0.x < 5.0.11 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112643	WordPress 4.9.x < 4.9.16 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112642	WordPress 4.8.x < 4.8.15 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112641	WordPress 4.7.x < 4.7.19 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112640	WordPress 4.6.x < 4.6.20 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112639	WordPress 4.5.x < 4.5.23 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112638	WordPress 4.4.x < 4.4.24 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112637	WordPress 4.3.x < 4.3.25 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112636	WordPress 4.2.x < 4.2.29 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112635	WordPress 4.1.x < 4.1.32 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112634	WordPress 4.0.x < 4.0.32 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112633	WordPress 3.9.x < 3.9.33 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112632	WordPress 3.8.x < 3.8.35 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
112631	WordPress 3.7.x < 3.7.35 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
142626	Debian DSA-4784-1 : wordpress - security update	Nessus	Debian Local Security Checks	critical
142504	Debian DLA-2429-1 : wordpress security update	Nessus	Debian Local Security Checks	critical
142420	WordPress < 5.5.2 Multiple Vulnerabilities	Nessus	CGI abuses	critical

Detections

Analytics

CVE-2020-28034

medium

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical