CVE-2023-25581 Deserialization of untrusted data in InternalAttributeHandler in pac4j
Remote code execution via unsafe Java deserialization in pac4j-core when processing specially crafted attributes in UserProfile objects.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-25581?
CVE-2023-25581 is a critical unsafe deserialization vulnerability in pac4j, published on 10 Oct 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
pac4j is a security framework for Java. `pac4j-core` prior to version 4.0.0 is affected by a Java deserialization vulnerability. The vulnerability affects systems that store externally controlled values in attributes of the `UserProfile` class from pac4j-core. It can be exploited by providing an attribute that contains a serialized Java object with a special prefix `{#sb64}` and Base64 encoding. This issue may lead to Remote Code Execution (RCE) in the worst case. Although a `RestrictedObjectInputStream` is in place, that puts some restriction on what classes can be deserialized, it still allows a broad range of java packages and potentially exploitable with different gadget chains. pac4j versions 4.0.0 and greater are not affected by this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-502
Which versions are affected by CVE-2023-25581?
2 open source packages ship an affected version, including org.pac4j:pac4j-core.
| Package | Affected | Fixed in |
|---|---|---|
org.pac4j:pac4j-core Maven | All versions | 4.0.0 |
org.pac4j:pac4j-core Maven | All versions | 4.0.0 |
How do I fix CVE-2023-25581?
Upgrade org.pac4j:pac4j-core to 4.0.0 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2023-25581 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-25581 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-76mw-6p95-x9x5.