log4shell
jdk8u
log4shell | jdk8u | |
---|---|---|
41 | 6 | |
1,876 | 201 | |
- | 1.0% | |
9.9 | 8.5 | |
almost 2 years ago | 16 days ago | |
Python | Java | |
- | GNU General Public License v3.0 only |
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log4shell
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Wetsvoorstel om cyberdreigingsinformatie breder te delen naar Tweede Kamer | Netherlands proposes law change to allow it's NCSC to share information more widely - Bill to share cyber threat information more broadly to the House of Representatives
I hope more organizations and governments do this. They had an excellent resource for Log4J. https://github.com/NCSC-NL/log4shell
- Are older OSs (specifically Mojave) extremely vulnerable to log4j, since they are no longer being patched?
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Western Digital warns owners of My Cloud hard drives to update immediately
A few
- Log4j2 and consumer routers
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Log4j UPDATE: 2.16 has a 7.5 DoS, 2.17 released
Nice list - https://github.com/NCSC-NL/log4shell/blob/main/software/README.md
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Log4J – A 10 step mitigation plan
There are various tools, nicely again enumerated by NCSC-NL at their Github repository with which you can detect whether you are vulnerable. See which one you like best given the situation you are in.
Check what other software you are running and see if the software is vulnerable according to the list published by the NCSC-NL. CISA.gov has a similar registry.
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I'm the closest thing to a system administrator at my company, and I don't know anything... what do I do about log4j, if anything?
There are multiple lists of software, the one I use is by the Dutch Cyber Security Center: https://github.com/NCSC-NL/log4shell/tree/main/software Everyday I cross reference on new changes and see if it effects my list. The list can be quite extensive and you might miss the most obvious ones like you FW, switches, SAN or some print software.
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Log4J - Have your customer been breached? What have you seen if anything?
NCSC-NL has a researched list of specific vulnerabilities.
- GLPI IS NOT affected by the Log4j vulnerability CVE-2021-44228
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?
Metabase - The simplest, fastest way to get business intelligence and analytics to everyone in your company :yum:
jdk8u_jdk
interactsh - An OOB interaction gathering server and client library
apache-log4j-poc - Apache Log4j 远程代码执行
grype - A vulnerability scanner for container images and filesystems
syft - CLI tool and library for generating a Software Bill of Materials from container images and filesystems
glpi-agent - GLPI Agent
openjdk8-upstream-binaries - Archived release scripts/releases of OpenJDK 8u project builds. Superseded by Eclipse Temurin releases.
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/
SpongeForge - A Forge mod that implements SpongeAPI
marshalsec