Command injection in bash (Alpine package)



| Updated: 2023-08-08
Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2014-6271
CWE-ID CWE-77
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
 bash (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) Command injection

EUVDB-ID: #VU5295

Risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2014-6271

CWE-ID: CWE-77 - Command injection

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary commands on the target system.

The vulnerability exists due to incorrect parsing of environment variables. A remote attacker can execute arbitrary code on the target system 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.

Successful exploitation may allow an attacker to gain complete control over vulnerable system.

Exploitation example:

env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

Note: this vulnerability was being actively exploited in the wild.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bash (Alpine package): 4.2.037-r0 - 4.2.045-r2

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=97da490163f2462899ff86143f9a9abc960e5269
https://git.alpinelinux.org/aports/commit/?id=6d8b4b43edacc55a50dcdbcb2cbf6c5da00e8a31
https://git.alpinelinux.org/aports/commit/?id=ad7e76b785a6fb778ab22473f0ec4ed78805a376
https://git.alpinelinux.org/aports/commit/?id=0e3b7e96471caf6ae1e226e4413e5d7a2852ac0a
https://git.alpinelinux.org/aports/commit/?id=07e6144b76bad51a8dfcfae1eade5b4571c534c3


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.



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