GHSA-9vm7-v8wj-3fqw CVE-2023-6927
keycloak-core: open redirect via "form_post.jwt" JARM response mode
Medium
Maven
- Severity
- 4.6 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 1.11%
- Chance of exploitation in the next 30 days. Higher than 65.89% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
- Fix
23.0.4- Upgrade org.keycloak:keycloak-core to this version or later
Description
An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt". It is observed that changing the response_mode parameter in the original proof of concept from "form_post" to "form_post.jwt" can bypass the security patch implemented to address CVE-2023-6134.
Affected versions
Maven
| Package | Vulnerable | Fixed in |
|---|---|---|
| org.keycloak:keycloak-core | < 23.0.4 |
23.0.4 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
org.keycloak:keycloak-core Maven → 23.0.4
- maven
<dependency><groupId>org.keycloak</groupId><artifactId>keycloak-core</artifactId><version>23.0.4</version></dependency>- gradle
implementation("org.keycloak:keycloak-core:23.0.4")
Severity breakdown
CVSS 3.1 4.6
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Weakness
CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
How to prevent it
- Implementation: Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue." Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright. Use a list of approved URLs or domains to be used for redirection.
- Architecture and Design: Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.
- Architecture and Design: When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs. For example, ID 1 could map to "/login.asp" and ID 2 could map to "http://www.example.com/". Features such as the ESAPI AccessReferenceMap [REF-45] provide this capability.
- Architecture and Design: Ensure that no externally-supplied requests are honored by requiring that all redirect requests include a unique nonce generated by the application [REF-483]. Be sure that the nonce is not predictable (CWE-330).
- Architecture and Design, Implementation: Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls. Many open redirect problems occur because the programmer assumed that certain inputs could not be modified, such as cookies and hidden form fields.
- Operation: Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
References
Advisories
Packages
Other links
- github.com/keycloak/keycloak/security/advisories/GHSA-9vm7-v8wj-3fqw
- access.redhat.com/errata/RHSA-2024:0094
- access.redhat.com/errata/RHSA-2024:0095
- access.redhat.com/errata/RHSA-2024:0096
- access.redhat.com/errata/RHSA-2024:0097
- access.redhat.com/errata/RHSA-2024:0098
- access.redhat.com/errata/RHSA-2024:0100
- access.redhat.com/errata/RHSA-2024:0101
- access.redhat.com/security/cve/CVE-2023-6927
- bugzilla.redhat.com/show_bug.cgi
- access.redhat.com/errata/RHSA-2024:0798
- access.redhat.com/errata/RHSA-2024:0799
- access.redhat.com/errata/RHSA-2024:0800
- access.redhat.com/errata/RHSA-2024:0801
- access.redhat.com/errata/RHSA-2024:0804
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-q4xq-445g-g6ch Keycloak allows cross-site scripting (XSS) | Low | Also affects org.keycloak:keycloak-core |
| GHSA-93ww-43rr-79v3 Keycloak mTLS Authentication Bypass via Reverse Proxy TLS Termination | High | Also affects org.keycloak:keycloak-core |
| GHSA-w97f-w3hq-36g2 Keycloak Denial of Service vulnerability | High | Also affects org.keycloak:keycloak-core |
| GHSA-xmmm-jw76-q7vg Keycloaks's One Time Passcode (OTP) is valid longer than expiration timeSeverity | Medium | Also affects org.keycloak:keycloak-core |
| GHSA-g4gc-rh26-m3p5 Keycloak Open Redirect vulnerability | Medium | Also affects org.keycloak:keycloak-core |
| GHSA-5q66-v53q-pm35 Keycloak vulnerable to Plaintext Storage of User Password | High | Also affects org.keycloak:keycloak-core |
| GHSA-5cc8-pgp5-7mpm Keycloak Untrusted Certificate Validation vulnerability | Medium | Also affects org.keycloak:keycloak-core |
| GHSA-c7xw-p58w-h6fj Keycloak: Impersonation and lockout possible through incorrect handling of email trust | Medium | Also affects org.keycloak:keycloak-core |
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