yahoo-eng-team team mailing list archive

[Jeremy Stanley <fungi@xxxxxxxxxxx>]

Thanks for the feedback everyone. We'll classify it as a security
hardening opportunity in that case, no advisory needed.

** Changed in: ossa
       Status: Incomplete => Won't Fix

** Information type changed from Public Security to Public

** Tags added: security

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https://bugs.launchpad.net/bugs/1842749

Title:
  CSV Injection Possible in Compute Usage History

Status in OpenStack Dashboard (Horizon):
  In Progress
Status in OpenStack Security Advisory:
  Won't Fix

Bug description:
  Many spreadsheet programs, such as Excel, LibreOffice, and OpenOffice, will parse and treat cells with special metacharacters as formulas. These programs can open comma-separated values (CSV) files and treat them as spreadsheets. If an attacker can influence the contents
  of CSV file, then that can allow the attacker to inject code that will execute when someone opens the CSV file through a spreadsheet program.
  In the Compute Overview panel in Horizon, there is a section titled “Usage Summary.” This section has a feature for downloading a CSV document of that usage summary. The contents of the CSV document include the name of the instances and other points of data such as its current state or how many resources it consumes.
  An attacker could create an instance with a malicious name beginning with an equals sign (=) or at sign (‘@’). These are both recognized in Excel as metacharacters for a formula. The attacker can create an instance name that includes a payload that will execute code such as:

  =cmd|' /C calc'!A0

  This payload opens the calculator program when the resulting CSV is
  opened on a Windows machine with Microsoft Excel. An attacker could
  easily substitute this payload with another that runs any arbitrary
  shell commands.

  Reproduction Steps:

  1. Access an OpenStack project, navigate to the Instances section.
  2. Create an instance with the following name:
  =cmd|' /C calc'!A0
  3. Navigate to the Overview section.
  4. Refresh the page until the new instance shows up in the Usage list.
  5. Click the button titled “DOWNLOAD CSV SUMMARY.”
  6. Observe the generated CSV file.

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