GNU · Bourne-Again Shell (Bash)
CVE-2014-6271
GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability
Qué es
GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution, aka "ShellShock." NOTE: the original fix for this issue was incorrect; CVE-2014-7169 has been assigned to cover the vulnerability that is still present after the incorrect fix.
CISA: GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute code.
Qué hacer
Apply updates per vendor instructions.
Plazo para las agencias federales de EE. UU.: 28 de julio de 2022
- Añadida a la lista de CISA
- 28 de enero de 2022
- Publicada
- 24 de septiembre de 2014
- Gravedad
- Crítica 9,8 CVSS 3.1
- Probabilidad de ataques en los próximos 30 días (EPSS)
- >99,9% entre el 0,1% superior de todas las vulnerabilidades conocidas
- Debilidad
- CWE-78
- Más detalles
- NVD · CVE.org · CISA
Todas las referencias (20)
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00034.html
- http://marc.info/?l=bugtraq&m=141577137423233&w=2
- http://marc.info/?l=bugtraq&m=142719845423222&w=2
- http://marc.info/?l=bugtraq&m=141216668515282&w=2
- http://rhn.redhat.com/errata/RHSA-2014-1295.html
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00037.html
- http://marc.info/?l=bugtraq&m=141383138121313&w=2
- http://marc.info/?l=bugtraq&m=142721162228379&w=2
- http://marc.info/?l=bugtraq&m=142358026505815&w=2
- http://marc.info/?l=bugtraq&m=142719845423222&w=2
- https://www.exploit-db.com/exploits/37816/
- http://packetstormsecurity.com/files/128517/VMware-Security-Advisory-2014-0010.html
- http://www-01.ibm.com/support/docview.wss?uid=ssg1S1004897
- http://www-01.ibm.com/support/docview.wss?uid=swg21685749
- https://www.exploit-db.com/exploits/39918/
- https://securityblog.redhat.com/2014/09/24/bash-specially-crafted-environment-variables-code-injection-attack/
- https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk1…
- http://www.securityfocus.com/archive/1/533593/100/0/threaded
- http://www-01.ibm.com/support/docview.wss?uid=swg21686084
- http://www-01.ibm.com/support/docview.wss?uid=swg21686479
Más fallos explotados de GNU
| Añadido | Vulnerabilidad | Producto | Gravedad | Prob. de ataque |
|---|---|---|---|---|
| 28 ene 2022 | Arbitrary Code Execution | Bourne-Again Shell (Bash) | Crítica 9,8 | 99,9% |
| 26 ene 2026 | Argument Injection | InetUtils | Crítica 9,8 | 99% |
| 2 oct 2025 | Bash OS Command Injection | GNU Bash | Alto 8,8 | 99,7% |
| 21 nov 2023 | C Library Buffer Overflow | GNU C Library | Alto 7,8 | 64% |
Fuentes: Known Exploited Vulnerabilities (CISA, dominio público), CVE records (cve.org) y EPSS (FIRST). La probabilidad de ataque es la estimación EPSS de que alguien intente explotar el fallo en los próximos 30 días.