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Vulnerability Spotlight: Authentication bypass and enumeration vulnerabilities in Ghost CMS
Dave McDaniel and other members of Cisco Talos discovered these vulnerabilities. Cisco Talos recently discovered two vulnerabilities in Ghost CMS, one authentication bypass vulnerability and one enumeration vulnerability. Ghost is a content management system with tools to build a website, publish content and send newsletters. Ghost offers paid subscriptions to
Wednesday, December 21, 2022 12:12
Dave McDaniel and other members of Cisco Talos discovered these vulnerabilities.
Cisco Talos recently discovered two vulnerabilities in Ghost CMS, one authentication bypass vulnerability and one enumeration vulnerability.
Ghost is a content management system with tools to build a website, publish content and send newsletters. Ghost offers paid subscriptions to members and supports a number of integrations with external services.
Talos has identified an authentication bypass vulnerability that can lead to increased privileges. TALOS-2022-1624 (CVE-2022-41654) allows external users to update their newsletter preferences too liberally, which could allow a user full access to create and modify newsletters, including the default sent to all members.
TALOS-2022-1625 (CVE-2022-41697) is an enumeration vulnerability in the login functionality of Ghost which can lead to a disclosure of sensitive information.
An attacker can send HTTP requests to trigger these vulnerabilities.
Cisco Talos worked with Ghost to ensure that these issues were resolved and an update is available for affected customers, all in adherence to Cisco’s vulnerability disclosure policy.
Users are encouraged to update this affected product as soon as possible: Ghost Foundation Ghost 5.9.4. Talos tested and confirmed this version of Ghost could be exploited by these vulnerabilities.
The following Snort rules will detect exploitation attempts against these vulnerabilities: 60770. Additional rules may be released in the future and current rules are subject to change, pending additional vulnerability information. For the most current rule information, please refer to your Firepower Management Center or Snort.org.
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A user enumeration vulnerability exists in the login functionality of Ghost Foundation Ghost 5.9.4. A specially-crafted HTTP request can lead to a disclosure of sensitive information. An attacker can send a series of HTTP requests to trigger this vulnerability.
An authentication bypass vulnerability exists in the newsletter subscription functionality of Ghost Foundation Ghost 5.9.4. A specially-crafted HTTP request can lead to increased privileges. An attacker can send an HTTP request to trigger this vulnerability.
Cybersecurity researchers have detailed two security flaws in the JavaScript-based blogging platform known as Ghost, one of which could be abused to elevate privileges via specially crafted HTTP requests. Tracked as CVE-2022-41654 (CVSS score: 8.5), the authentication bypass vulnerability that allows unprivileged users (i.e., members) to make unauthorized modifications to newsletter settings.
### Impact On sites where members is enabled (this is the default) it is possible for members (unprivileged users) to make changes to newsletter settings. This gives unprivileged users the ability to view and change settings they were not intended to have access to. They are not able to escalate their privileges permanently or get access to further information. This issue was caused by a gap in our API validation for nested objects. Ghost(Pro) has already been patched. We can find no evidence that the issue was exploited on Ghost(Pro) prior to the patch being added. Self-hosters are impacted if running Ghost a version between v4.46.0 and v4.48.7 or any version of v5 prior to v5.22.7. Immediate action should be taken to secure your site - see patches & workarounds below. ### Patches - v4.48.8 / v5.22.7 are patched for all known exploits - v4.48.9 / v5.24.1 contain deeper fixes to the API to close the potential for this vulnerability to appear elsewhere or regress ### Workarounds...