CVE-2017-12621 Improper Restriction of XML External Entity Reference in Jelly
An attacker can exploit XML External Entity vulnerabilities in Apache Commons Jelly to read sensitive data or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-12621?
CVE-2017-12621 is a critical vulnerability in Apache Commons Jelly, published on 27 Sep 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
During Jelly (xml) file parsing with Apache Xerces, if a custom doctype entity is declared with a "SYSTEM" entity with a URL and that entity is used in the body of the Jelly file, during parser instantiation the parser will attempt to connect to said URL. This could lead to XML External Entity (XXE) attacks in Apache Commons Jelly before 1.0.1.
Weakness: CWE-611
Which versions are affected by CVE-2017-12621?
2 open source packages ship an affected version, including commons-jelly:commons-jelly. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
commons-jelly:commons-jelly Maven | All versions | 1.0.1 |
commons-jelly:commons-jelly Maven | All versions | 1.0.1 |
Products include Apache Commons Jelly.
How do I fix CVE-2017-12621?
Upgrade commons-jelly:commons-jelly to 1.0.1 or later.
Is CVE-2017-12621 being exploited?
There is no known exploitation of CVE-2017-12621 in the wild and no public exploit code.
Sources
Also known as GHSA-6g33-82gc-3pw5, UBUNTU-CVE-2017-12621.