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GHSA-f69v-xrj8-rhxf
No affected components available
Impact
It is possible for a remote unauthenticated user to escape from the HQL execution context and perform a blind SQL injection to execute arbitrary SQL statements on the database backend, including when "Prevent unregistered users from viewing pages, regardless of the page rights" and "Prevent unregistered users from editing pages, regardless of the page rights" options are enabled.
Depending on the used database backend, the attacker may be able to not only obtain confidential information such as password hashes from the database, but also execute UPDATE/INSERT/DELETE queries.
The vulnerability may be tested in a default installation of XWIki Standard Flavor, including using the official Docker containers.
An example query, which leads to SQL injection with MySQL/MariaDB backend is shown below:
time curl "http://127.0.0.1:8080/rest/wikis/xwiki/query?q=where%20doc.name=length('a')*org.apache.logging.log4j.util.Chars.SPACE%20or%201%3C%3E%271%5C%27%27%20union%20select%201,2,3,sleep(10)%20%23%27&type=hql&distinct=0"
When executed, the response from the server will come after a delay of 10 extra seconds, indicating successful execution of the injected SQL statement.
An example of a query for the PostgreSQL database backend is shown below:
curl "https://127.0.0.1:8080/rest/wikis/xwiki/query?q=where%20%24%24='%24%24=concat(%20chr(%2061%20),(chr(%2039%20))%20)%20;select%201%20--%20comment'&type=hql&distinct=0"
Both requests employ database backend dependent techniques of breaking out of HQL query context, described, for example, here: https://www.sonarsource.com/blog/exploiting-hibernate-injections.
Patches
This has been patched in 16.10.1, 16.4.6 and 15.10.16.
Workarounds
There is no known workaround, other than upgrading XWiki.
References
https://jira.xwiki.org/browse/XWIKI-22691
For more information
If you have any questions or comments about this advisory:
- Open an issue in Jira XWiki.org
- Email us at Security Mailing List
Attribution
Sergey Anufrienko from Kaspersky ICS-CERT vulnerability research team reported this vulnerability.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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