- Vulnerabilities 75,518
GNU Bash Environment Variable Handling Shell Remote Command Execution Vulnerability(SIP Check)
Published: 2014-09-29 06:17:16
CVE Author: NIST National Vulnerability Database
CVSS Base Vector:
AV:N/AC:L/Au:N/C:C/I:C/A:C
Summary:
This host is installed with GNU Bash Shell
and is prone to remote command execution vulnerability.
Detection Method:
Send a crafted command via SIP INVITE
request and check remote command execution.
Technical Details:
GNU bash contains a flaw that is triggered
when evaluating environment variables passed from another environment.
After processing a function definition, bash continues to process trailing strings.
The exec module in Kamailio, Opensips and probably every other SER fork passes the received
SIP headers as environment variables to the invoking shell. A proxy is vulnerable using any
of the exec functions and has the 'setvars' parameter set to the default value '1'.
Impact:
Successful exploitation will allow remote
or local attackers to inject shell commands, allowing local privilege
escalation or remote command execution depending on the application vector.
Affected Versions:
GNU Bash through 4.3
Recommendations:
Apply the patch or upgrade to latest version.
Solution Type:
Vendor Patch
Detection Type:
Remote Vulnerability
https://nvd.nist.gov/vuln/detail/CVE-2014-6271
https://nvd.nist.gov/vuln/detail/CVE-2014-6278
https://www.securityfocus.com/bid/70103
https://github.com/zaf/sipshock
https://access.redhat.com/solutions/1207723
https://bugzilla.redhat.com/show_bug.cgi?id=1141597
https://blogs.akamai.com/2014/09/environment-bashing.html
https://community.qualys.com/blogs/securitylabs/2014/09/24/
http://www.gnu.org/software/bash/
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