10 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
0.973 High
EPSS
Percentile
99.9%
GNU Bash through 4.3 bash43-026 does not properly parse function
definitions in the values of environment variables, which allows remote
attackers to execute arbitrary commands 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.
NOTE: this vulnerability exists because of an incomplete fix for
CVE-2014-6271, CVE-2014-7169, and CVE-2014-6277.
Author | Note |
---|---|
mdeslaur | this issue is mitigated by Florian Weimer’s prefix-suffix patch that is included in https://ubuntu.com/security/notices/USN-2364-1 since bash parser vulnerabilities are now limited to specially named environment variables, and as such are no longer directly exposed to CGI scripts, SSH, etc. Once an upstream patch is made available, we will release bash updates, but we don’t consider this to be a critical issue requiring immediate attention. |
lcamtuf.blogspot.ca/2014/09/bash-bug-apply-unofficial-patch-now.html
lcamtuf.blogspot.ca/2014/10/bash-bug-how-we-finally-cracked.html
seclists.org/fulldisclosure/2014/Oct/9
launchpad.net/bugs/cve/CVE-2014-6278
nvd.nist.gov/vuln/detail/CVE-2014-6278
security-tracker.debian.org/tracker/CVE-2014-6278
ubuntu.com/security/notices/USN-2380-1
www.cve.org/CVERecord?id=CVE-2014-6278