Menu
Critical XSS flaws patched in WordPress and popular plug-in

Critical XSS flaws patched in WordPress and popular plug-in

The vulnerabilities could allow attackers to create administrator accounts and take control of websites

New security updates released for the WordPress content management system and one of its popular plug-ins fix cross-site scripting (XSS) vulnerabilities that could allow attackers to take control of websites.

The WordPress development team released Thursday WordPress 4.0.1, 3.9.3, 3.8.5 and 3.7.5 as critical security updates.

The 3.9.3, 3.8.5 and 3.7.5 updates address an XSS vulnerability in the comment boxes of WordPress posts and pages. An attacker could exploit this flaw to create comments with malicious JavaScript code embedded in them that would get executed by the browsers of users seeing those comments.

"In the most obvious scenario the attacker leaves a comment containing the JavaScript and some links in order to put the comment in the moderation queue," said Jouko Pynnonen, the security researcher who found the flaw, in an advisory. "When a blog administrator goes to the Dashboard/Comments section to review new comments, the JavaScript gets executed. The script can then perform operations with administrator privileges."

Such a rogue operation can be the creation of a second WordPress administrator account with an attacker-specified password. What makes things worse is that the flaw can typically be exploited without authentication, because the action of posting a comment on a WordPress blog does not require an account by default.

The comment XSS vulnerability only affects WordPress 3.9.2 and earlier versions, not WordPress 4.0. However, the 4.0.1 update, as well as the 3.x ones, also address three other XSS flaws that can be used to compromise WordPress sites if the attacker has access to a contributor or author account on them.

The new releases also fix a cross-site request forgery flaw that could be used to trick a user into changing their password, as well as a denial-of-service issue.

Separately, the developers of WP-Statistics, a WordPress plug-in that gathers and displays visitor statistics, issued an update to fix a high-risk XSS flaw that's similar to the ones fixed in the content management system itself.

"The plugin fails to properly sanitize some of the data it gathers for statistical purposes, which are controlled by the website's visitors," said Marc-Alexandre Montpas, a researcher at Web security firm Sucuri, in a blog post. "If an attacker decided to put malicious Javascript code in the affected parameter, it would be saved in the database and printed as-is in the administrative panel, forcing the victim's browser to perform background tasks on its behalf."

The Sucuri researchers were able to leverage the flaw to create a new admin account on a test site.

Users of WP-Statistics are advised to update to version 8.3.1 of the plug-in as soon as possible in order to protect their sites. WP-Statistics has been downloaded over 830,000 times from the official WordPress plug-in repository.

WordPress sites are frequently targeted by cybercriminals who rely on compromised legitimate sites for many of their malicious activities, from hosting spam and malware to launching drive-by download attacks against Web users.


Follow Us

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags patch managementonline safetyWordpresspatchesSucuri

Events

Why experience is the new battleground for partners

Join us for an exclusive webinar, in association with Hewlett Packard Enterprise and Technology Services Industry Association (TSIA) and learn about the latest industry insights and how technology services continue to evolve to deliver differentiated value, and how partners can be successful in 2021 and beyond.

Featured

Slideshows

The Kiwi channel gathers for the 2020 Reseller News Women in ICT Awards

The Kiwi channel gathers for the 2020 Reseller News Women in ICT Awards

Hundreds of leaders from the New Zealand IT industry gathered at the Hilton in Auckland on 17 November to celebrate the finest female talent in the Kiwi channel and recognise the winners of the Reseller News Women in ICT Awards (WIICTA) 2020.

The Kiwi channel gathers for the 2020 Reseller News Women in ICT Awards
Leading female front runners honoured at the 2020 Reseller News Women in ICT Awards

Leading female front runners honoured at the 2020 Reseller News Women in ICT Awards

The leading female front runners of the New Zealand ICT industry joined together for the annual Reseller News Women in ICT Awards event at the Hilton in Auckland, during which hundreds of guests celebrated 13 outstanding individuals who won awards, chosen from more than 50 finalists representing over 30 organisations.

Leading female front runners honoured at the 2020 Reseller News Women in ICT Awards
Channel gathers to celebrate the Reseller News Innovation Awards 2020 winners

Channel gathers to celebrate the Reseller News Innovation Awards 2020 winners

More than 500 channel leaders gathered in Auckland on 21 October at the ​Reseller News Innovation Awards ​2020 to celebrate the achievements of the New Zealand technology industry's top partners, start-ups, vendors, distributors and individuals.

Channel gathers to celebrate the Reseller News Innovation Awards 2020 winners
Show Comments