Apache · Log4j2
CVE-2021-45046
Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack
Cos'è
It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.
CISA: Apache Log4j2 contains a deserialization of untrusted data vulnerability due to the incomplete fix of CVE-2021-44228, where the Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations.
Cosa fare
Apply updates per vendor instructions.
Scadenza per le agenzie federali USA: 22 maggio 2023
- Aggiunta all'elenco CISA
- 1 maggio 2023
- Pubblicato
- 14 dicembre 2021
- Gravità
- Critica 9,0 CVSS 3.1
- Probabilità di attacchi nei prossimi 30 giorni (EPSS)
- >99,9% tra il 0,1% più alto di tutte le vulnerabilità note
- Tipo di debolezza
- CWE-917
- Più dettagli
- NVD · CVE.org · CISA
Tutte le fonti (20)
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
- https://www.debian.org/security/2021/dsa-5022
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EOKPQGV24RRB…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SIG7FZULMNK2…
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
- https://www.oracle.com/security-alerts/alert-cve-2021-44228.html
- https://www.cve.org/CVERecord?id=CVE-2021-44228
- http://www.openwall.com/lists/oss-security/2021/12/14/4
- https://logging.apache.org/log4j/2.x/security.html
- https://www.kb.cert.org/vuls/id/930724
- https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00646.html
- http://www.openwall.com/lists/oss-security/2021/12/15/3
- https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf
- http://www.openwall.com/lists/oss-security/2021/12/18/1
- https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
Altre falle sfruttate di Apache
| Aggiunto | Vulnerabilità | Prodotto | Gravità | Probabilità di attacco |
|---|---|---|---|---|
| 10 dic 2021 | Remote Code Execution | Log4j2 | Critica 10,0 | >99,9% |
| 8 ott 2026 | Command Injection | Struts | Alta 8,1 | 97% |
| 4 ago 2026 | Missing Encryption of Sensitive Data | Tomcat | Alta 7,5 | 99% |
| 16 apr 2026 | Improper Input Validation | ActiveMQ | Alta 8,8 | 98% |
| 1 mag 2025 | Improper Escaping of Output | HTTP Server | Critica 9,1 | >99,9% |
| 1 apr 2025 | Path Equivalence | Tomcat | Critica 10,0 | 99,9% |
| 4 feb 2025 | Forced Browsing | OFBiz | Critica 9,8 | >99,9% |
| 18 set 2024 | Improper Access Control | HugeGraph-Server | Critica 9,8 | 99,2% |
Fonti: Known Exploited Vulnerabilities (CISA, pubblico dominio), CVE records (cve.org) e EPSS (FIRST). La probabilità di attacco è la stima EPSS che qualcuno provi a sfruttare la falla nei prossimi 30 giorni.