GHSA-gw4j-4229-q4px CVE-2021-25640
Server-Side Request Forgery in Apache Dubbo
Medium
Maven
- Severity
- 6.1 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 2.07%
- Chance of exploitation in the next 30 days. Higher than 81.45% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
- CWE-918 Server-Side Request Forgery (SSRF)
- Fix
- Available
- 2 packages have a fixed version
Description
In Apache Dubbo prior to 2.6.9 and 2.7.10, the usage of parseURL method will lead to the bypass of white host check which can cause open redirect or SSRF vulnerability.
Affected versions
Maven
| Package | Vulnerable | Fixed in |
|---|---|---|
| com.alibaba:dubbo | >= 2.5.0, < 2.6.9 |
2.6.9 |
| org.apache.dubbo:dubbo | >= 2.5.0, < 2.7.10 |
2.7.10 |
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.
com.alibaba:dubbo Maven → 2.6.9
- maven
<dependency><groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><version>2.6.9</version></dependency>- gradle
implementation("com.alibaba:dubbo:2.6.9")
org.apache.dubbo:dubbo Maven → 2.7.10
- maven
<dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo</artifactId><version>2.7.10</version></dependency>- gradle
implementation("org.apache.dubbo:dubbo:2.7.10")
Severity breakdown
CVSS 3.1 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- 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].
CWE-918: Server-Side Request Forgery (SSRF)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
References
Advisories
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-97rv-88gf-phvr Apache Dubbo: Bypass deny serialize list check in Apache Dubbo | Critical | Also affects org.apache.dubbo:dubbo |
| GHSA-6x49-w35h-wqrj Bypass serialize checks in Apache Dubbo | Critical | Also affects org.apache.dubbo:dubbo |
| GHSA-933g-v89r-x8pf Apache Dubbo vulnerable to Deserialization of Untrusted Data | Critical | Also affects org.apache.dubbo:dubbo |
| GHSA-5qwq-g2hx-r6f7 Hessian Lite for Apache Dubbo deserialization vulnerability | Critical | Also affects org.apache.dubbo:dubbo |
| GHSA-gm48-83x4-84jg Server-side request forgery in Apache Dubbo | Medium | Also affects com.alibaba:dubbo |
| GHSA-7wfc-x4f7-gg2x Code injection in Apache Dubbo | Critical | Also affects org.apache.dubbo:dubbo |
| GHSA-5mc7-m686-p6jg Deserialization of Untrusted Data in Apache Dubbo | Critical | Also affects com.alibaba:dubbo |
| GHSA-qmfc-6www-fjqw Code injection in Apache Dubbo | Critical | Also affects com.alibaba:dubbo |
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