Apache · Log4j2
CVE-2021-45046
Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack
O que é
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.
O que fazer
Apply updates per vendor instructions.
Prazo para as agências federais dos EUA: 22 de maio de 2023
- Adicionada à lista da CISA
- 1 de maio de 2023
- Publicada
- 14 de dezembro de 2021
- Gravidade
- Crítica 9,0 CVSS 3.1
- Chance de ataques nos próximos 30 dias (EPSS)
- >99,9% entre os 0,1% mais altos de todas as vulnerabilidades conhecidas
- Fraqueza
- CWE-917
- Mais detalhes
- NVD · CVE.org · CISA
Todas as referências (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
Mais falhas exploradas de Apache
| Adicionado | Vulnerabilidade | Produto | Gravidade | Chance de ataque |
|---|---|---|---|---|
| 10 de dez. de 2021 | Remote Code Execution | Log4j2 | Crítica 10,0 | >99,9% |
| 8 de out. de 2026 | Command Injection | Struts | Alto 8,1 | 97% |
| 4 de ago. de 2026 | Missing Encryption of Sensitive Data | Tomcat | Alto 7,5 | 99% |
| 16 de abr. de 2026 | Improper Input Validation | ActiveMQ | Alto 8,8 | 98% |
| 1 de mai. de 2025 | Improper Escaping of Output | HTTP Server | Crítica 9,1 | >99,9% |
| 1 de abr. de 2025 | Path Equivalence | Tomcat | Crítica 10,0 | 99,9% |
| 4 de fev. de 2025 | Forced Browsing | OFBiz | Crítica 9,8 | >99,9% |
| 18 de set. de 2024 | Improper Access Control | HugeGraph-Server | Crítica 9,8 | 99,2% |
Fontes: Known Exploited Vulnerabilities (CISA, domínio público), CVE records (cve.org) e EPSS (FIRST). A chance de ataque é a estimativa EPSS de que alguém tente explorar a falha nos próximos 30 dias.