CVE-2020-13936

Velocity Sandbox Bypass

Description

An attacker that is able to modify Velocity templates may execute arbitrary Java code or run arbitrary system commands with the same privileges as the account running the Servlet container. This applies to applications that allow untrusted users to upload/modify velocity templates running Apache Velocity Engine versions up to 2.2.

Remediation

Workaround:

Applications using Apache Velocity that allow untrusted users to upload templates should upgrade to version 2.3. This version adds additional default restrictions on what methods/properties can be accessed in a template.

8.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 12.10% Top 10%

Vendor Advisory gentoo.org Vendor Advisory apache.org

Affected: Apache Software Foundation Apache Velocity Engine

References

Link	Tags
https://lists.apache.org/thread.html/r01043f584cbd47959fabe18fff64de940f81a65024bb8dddbda31d9a%40%3Cuser.velocity.apache.org%3E	vendor advisory mailing list
https://lists.apache.org/thread.html/rb042f3b0090e419cc9f5a3d32cf0baff283ccd6fcb1caea61915d6b6%40%3Ccommits.velocity.apache.org%3E	mailing list
http://www.openwall.com/lists/oss-security/2021/03/10/1	third party advisory mailing list
https://lists.apache.org/thread.html/r3ea4c4c908505b20a4c268330dfe7188b90c84dcf777728d02068ae6%40%3Cannounce.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rd2a89e17e8a9b451ce655f1a34117752ea1d18a22ce580d8baa824fd%40%3Ccommits.druid.apache.org%3E	mailing list
https://lists.debian.org/debian-lts-announce/2021/03/msg00019.html	third party advisory mailing list
https://lists.apache.org/thread.html/re641197d204765130618086238c73dd2ce5a3f94b33785b587d72726%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rbee7270556f4172322936b5ecc9fabf0c09f00d4fa56c9de1963c340%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/reab5978b54a9f4c078402161e30a89c42807b198814acadbe6c862c7%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rd7e865c87f9043c21d9c1fd9d4df866061d9a08cfc322771160d8058%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/re8e7482fe54d289fc0229e61cc64947b63b12c3c312e9f25bf6f3b8c%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r0bc98e9cd080b4a13b905c571b9bed87e1a0878d44dbf21487c6cca4%40%3Cdev.santuario.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r39de20c7e9c808b1f96790875d33e58c9c0aabb44fd9227e7b3dc5da%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r17cb932fab14801b14e5b97a7f05192f4f366ef260c10d4a8dba8ac9%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r4cd59453b65d4ac290fcb3b71fdf32b4f1f8989025e89558deb5a245%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r7f209b837217d2a0fe5977fb692e7f15d37fa5de8214bcdc4c21d9a7%40%3Ccommits.turbine.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r293284c6806c73f51098001ea86a14271c39f72cd76af9e946d9d9ad%40%3Cdev.ws.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rf7d369de88dc88a1347006a3323b3746d849234db40a8edfd5ebc436%40%3Cdev.ws.apache.org%3E	mailing list
https://security.gentoo.org/glsa/202107-52	third party advisory vendor advisory
https://lists.apache.org/thread.html/r9dc2505651788ac668299774d9e7af4dc616be2f56fdc684d1170882%40%3Cusers.activemq.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r52a5129df402352adc34d052bab9234c8ef63596306506a89fdc7328%40%3Cusers.activemq.apache.org%3E	mailing list
https://www.oracle.com/security-alerts/cpujan2022.html	third party advisory patch
https://www.oracle.com/security-alerts/cpuapr2022.html	third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2020-13936?: CVE-2020-13936 has been scored as a high severity vulnerability.
How to fix CVE-2020-13936?: As a workaround for remediating CVE-2020-13936: Applications using Apache Velocity that allow untrusted users to upload templates should upgrade to version 2.3. This version adds additional default restrictions on what methods/properties can be accessed in a template.
Is CVE-2020-13936 being actively exploited in the wild?: It is possible that CVE-2020-13936 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~12% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-13936?: CVE-2020-13936 affects Apache Software Foundation Apache Velocity Engine.