Known exploited vulnerability
CVE-2014-6271
The short answer
CVE-2014-6271 affects n/a n/a and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-01-28: attackers are using it, so patch it first. The vendor has linked a patch.
What it is
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.
Weakness: CWE-78.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Jan 28, 2022
Federal due date Jul 28, 2022
EPSS, next 30 days
100%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
n/a. NVD's record lists the exact affected versions.
References
- access.redhat.com/articles/1200223 ExploitThird Party Advisory
- access.redhat.com/node/1200223 ExploitThird Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=1141597 Issue TrackingPatch
- help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes Broken LinkThird Party Advisory
- kb.bluecoat.com/index?page=content&id=SA82 Broken LinkThird Party Advisory
- kb.juniper.net/InfoCenter/index?page=content&id=JSA10648 Third Party Advisory
- kc.mcafee.com/corporate/index?page=content&id=SB10085 Broken LinkThird Party Advisory
- securityblog.redhat.com/2014/09/24/bash-specially-crafted-environment-variables-code-injection-attack/ ExploitThird Party Advisory
- support.apple.com/kb/HT6535 Third Party Advisory
- support.citrix.com/article/CTX200217 Third Party Advisory
- support.citrix.com/article/CTX200223 Permissions Required
- support.f5.com/kb/en-us/solutions/public/15000/600/sol15629.html Third Party Advisory
Questions
Is CVE-2014-6271 being exploited?
Yes. CISA added CVE-2014-6271 to its Known Exploited Vulnerabilities catalog on 2022-01-28, with a federal remediation due date of 2022-07-28.
How do I fix CVE-2014-6271?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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