CVE-2019-0195 Deserialization of Untrusted Data in Apache Tapestry

What is CVE-2019-0195?

CVE-2019-0195 is a critical unsafe deserialization vulnerability in Apache Tapestry, published on 16 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Manipulating classpath asset file URLs, an attacker could guess the path to a known file in the classpath and have it downloaded. If the attacker found the file with the value of the tapestry.hmac-passphrase configuration symbol, most probably the webapp's AppModule class, the value of this symbol could be used to craft a Java deserialization attack, thus running malicious injected Java code. The vector would be the t:formdata parameter from the Form component.

Weakness: CWE-502

Which versions are affected by CVE-2019-0195?

2 open source packages ship an affected version, including org.apache.tapestry:tapestry-core. It affects 1 product.

Products include Apache Tapestry.

How do I fix CVE-2019-0195?

Upgrade org.apache.tapestry:tapestry-core to 5.4.5 or later.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2019-0195 being exploited?

There is no known exploitation of CVE-2019-0195 in the wild and no public exploit code.

Other vulnerabilities in Apache Tapestry

• CVE-2022-46366 Apache Tapestry prior to version 4 (EOL) allows RCE though deserialization of untrusted input Critical 9.8
• CVE-2021-27850 Bypass of the fix for CVE-2019-0195 Critical 9.8
• CVE-2020-17531 Deserialization flaw in EOL Tapestry 4. Critical 9.8
• CVE-2019-10071 Timing attack on HMAC signature comparison in Apache Tapestry Critical 9.8
• CVE-2014-1972 Apache Tapestry Unsafe Object Storage High 7.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-6mwh-fw4p-75fj.