A new security vulnerability known as the GNU Bash or Shellshock bug could be make a major disaster to systems and Web hosts and even Internet-connected devices.
In a blog post yesterday, Robert Graham of Errata Security noted that someone is already using a massive Internet scan to locate vulnerable servers for attack. In a brief scan, he found over 3,000 servers that were vulnerable “just on port 80″—the Internet Protocol port used for normal Web Hypertext Transfer Protocol (HTTP) requests. And his scan broke after a short period, meaning that there could be vast numbers of other servers vulnerable. A Google search by Ars using advanced search parameters yielded over two billion webpages that at least partially fit the profile for the Shellshock exploit.
Ars Technica reports that the vulnerability could affect Unix and Linux devices, as well as hardware running Max OS X. According to Ars, a test on Mac OS X Mavericks (version 10.9.4) showed that it has “a vulnerable version of Bash”.
CVSS Severity (version 2.0):
CVSS v2 Base Score:10.0 (HIGH) (AV:N/AC:L/Au:N/C:C/I:C/A:C) (legend)
Impact Subscore: 10.0
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service