log4j-patch
jdk8u
log4j-patch | jdk8u | |
---|---|---|
4 | 6 | |
66 | 201 | |
- | 1.0% | |
0.0 | 8.5 | |
over 2 years ago | 16 days ago | |
Java | Java | |
Do What The F*ck You Want To Public License | GNU General Public License v3.0 only |
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log4j-patch
- log4j-patch: Parche no intrusivo para la vulnerabilidad RCE de #log4j2 🛠
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Warning for people playing on Minecraft servers. This is important!
There is also log4j-patch which might allow you to resolve issues with it.
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Log4j RCE Found
https://github.com/Glavo/log4j-patch
This is a non-intrusive patch that allows you to block this vulnerability without modifying the program code/updating the dependent. So you can use it to patch third-party programs, such as Minecraft.
The principle of the library is simple: It provides an empty JndiLookup to override the implementation in log4j. Log4j2 can handle this situation and safely disable JNDI lookup.
It is compatible with all versions of log4j2 (2.0~2.15).
jdk8u
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Seeing through hardware counters: a journey to threefold performance increase
Would an atomic mutable subclass cache (not sure what it's used for, downcasting?) be unnecessary in a language built around static rather than dynamic dispatch by default, like C/C++/Rust and perhaps Go? Or would it still speed up dynamically dispatched code, but is less practical or worthwhile so it isn't used in practice? (Though Rust's Arc also suffers from atomic contention similar to this blog post, when used across dozens of threads: https://pkolaczk.github.io/server-slower-than-a-laptop/)
Also it's somewhat ironic that the JVM source code (https://github.com/openjdk/jdk8u/blob/jdk8u352-b07/hotspot/s...) says "This code is rarely used, so simplicity is a virtue here" at the site of a bottleneck.
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Minecraft 1.8.9 Consistently Crashes after 5 Mins
Use the latest JDK (Developer's Kit) or JRE (Runtime Environment) for Java 8, compiled and distributed by AdoptOpenJDK from the official Read-Only source.
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How are LTS updates made?
The majority of the work on 8u, 11u, 17u releases happens in OpenJDK upstream, in so called JDK Updates Projects, by engineers from the interested JDK vendors. You can get a peek who does this kind of work from the repository histories, for example the most recent 11.0.13 is done by engineers from Red Hat (including yours truly), SAP, Azul, Microsoft, BellSoft, Tencent, Amazon, Alibaba, IBM, ARM, Google.
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Log4Shell Log4j vulnerability (CVE-2021-44228) – cheat-sheet reference guide
> whatever it returned would just get inserted as a string into the log output, no big deal.
Once you can inject anything that gets resolved, you have an information disclosure vulnerability unrelated to the RCE.
If I can just DNS resolve any ${env} variable from the JVM, a lot of systems are compromised by just exposing the env or system variables configured for runtime.
Just getting your $AWS_ACCESS_KEY_ID and $AWS_SECRET_ACCESS_KEY env vars can compromise your bucket (sure, that is a really unsafe setup now, but it was almost the standard a few years ago over configuring it explicitly).
So a logging system which will merely resolve a hostname derived from a variable was bad enough to compromise many systems.
The serialization loophole was fixed in a jdk8 update.
https://github.com/openjdk/jdk8u/commit/006e84fc77a582552e71...
But even with that in place, the information disclosure of java System or env properties is bad enough to break actual systems in prod.
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Log4j RCE Found
> Turns out, by including "." in some part of the URL to this remote class, Log4j lets off its guard & simply looks up to that server and dynamically loads the class file.
No it doesn't. That was disabled by default in 2009, and was disabled by default in every release of Java 8 or later: https://github.com/openjdk/jdk8u/commit/006e84fc77a582552e71...
Unless i am mistaken, i don't believe the attack as described by LunaSec actually works against a default-configured JVM released any time in the last decade.
What are some alternatives?
active-scan-plus-plus - ActiveScan++ Burp Suite Plugin
jdk8u_jdk
rogue-jndi - A malicious LDAP server for JNDI injection attacks
apache-log4j-poc - Apache Log4j 远程代码执行
Apache Log4j 2 - Apache Log4j 2 is a versatile, feature-rich, efficient logging API and backend for Java.
syft - CLI tool and library for generating a Software Bill of Materials from container images and filesystems
go-cache - An in-memory key:value store/cache (similar to Memcached) library for Go, suitable for single-machine applications.
openjdk8-upstream-binaries - Archived release scripts/releases of OpenJDK 8u project builds. Superseded by Eclipse Temurin releases.
nuclei-templates - Community curated list of templates for the nuclei engine to find security vulnerabilities.
lunasec - LunaSec - Dependency Security Scanner that automatically notifies you about vulnerabilities like Log4Shell or node-ipc in your Pull Requests and Builds. Protect yourself in 30 seconds with the LunaTrace GitHub App: https://github.com/marketplace/lunatrace-by-lunasec/
marshalsec