PhastPress <= 1.110 - Open Redirect
Strategic Overview
- Status
- Patched in 1.111
- Affected Plugin
- PhastPress
- Affected Version
<= 1.110- CVSS
- 6.1Medium
- Weakness type
- CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
- CVE
CVE-2021-24210
At a glance
CVE-2021-24210 is a medium-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the PhastPress WordPress plugin, affecting versions <= 1.110. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.111; sites on affected versions should update now. Disclosed March 2021, reported by Felipe Restrepo Rodriguez (pfelilpe).
Vulnerability Overview
There is an open redirect in the PhastPress WordPress plugin before 1.111 that allows an attacker to malform a request to a page with the plugin and then redirect the victim to a malicious page. There is also a support comment from another user one year ago (https://wordpress.org/support/topic/phast-php-used-for-remote-fetch/) that says that the php involved in the request only go to whitelisted pages, but it's possible to redirect the victim to any domain.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.
CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Reaching this weakness in PhastPress <= 1.110 takes a caller who can reach the endpoint. An open redirect is a page that takes a destination from the request and sends the browser there without checking that the destination belongs to the site.
A link that starts on a trusted domain finishes on an attacker's, which is what makes phishing and consent-screen abuse credible to the person clicking it. For PhastPress the fix is 1.111: builds <= 1.110 are affected, anything from 1.111 onward is not.
Remediation
Update to version 1.111, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to PhastPress: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: PhastPress 1.111 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in PhastPress
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