Attacker Value
Very Low
(1 user assessed)
Exploitability
Moderate
(1 user assessed)
User Interaction
Unknown
Privileges Required
Unknown
Attack Vector
Unknown
0

CVE-2009-2936

Disclosure Date: April 05, 2010 •
CVE-2009-2936
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

The Command Line Interface (aka Server CLI or administration interface) in the master process in the reverse proxy server in Varnish before 2.1.0 does not require authentication for commands received through a TCP port, which allows remote attackers to (1) execute arbitrary code via a vcl.inline directive that provides a VCL configuration file containing inline C code; (2) change the ownership of the master process via param.set, stop, and start directives; (3) read the initial line of an arbitrary file via a vcl.load directive; or (4) conduct cross-site request forgery (CSRF) attacks that leverage a victim’s location on a trusted network and improper input validation of directives. NOTE: the vendor disputes this report, saying that it is “fundamentally misguided and pointless.

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1
Ratings
  • Attacker Value
    Very Low
  • Exploitability
    Medium
No useful access
Technical Analysis

The (3) part of this does seem to be true, using vcl.load and supplying it a file will attempt to load the file. Because the file is most likely NOT a vcl file, the file will fail to load, however the error message echoed back to the user includes the first line of the file.
While you are able to read an arbitrary file, you’ll only get the first line, YMMV. The process is most likely also not running as root, so /etc/shadow where the first line would be great most likely won’t happen.

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CVSS V3 Severity and Metrics
Base Score:
None
Impact Score:
Unknown
Exploitability Score:
Unknown
Vector:
Unknown
Attack Vector (AV):
Unknown
Attack Complexity (AC):
Unknown
Privileges Required (PR):
Unknown
User Interaction (UI):
Unknown
Scope (S):
Unknown
Confidentiality (C):
Unknown
Integrity (I):
Unknown
Availability (A):
Unknown

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
n/a
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
auxiliary/scanner/varnish/varnish_cli_file_read
auxiliary/scanner/varnish/varnish_cli_login
Reporter
Unknown

Vendors

  • varnish.projects.linpro

Products

  • varnish 0.9,
  • varnish 0.9.1,
  • varnish 1.0,
  • varnish 1.0.1,
  • varnish 1.0.2,
  • varnish 1.0.3,
  • varnish 1.0.4,
  • varnish 1.1,
  • varnish 1.1.1,
  • varnish 1.1.2,
  • varnish 2.0,
  • varnish 2.0.1,
  • varnish 2.0.2,
  • varnish 2.0.3,
  • varnish 2.0.4,
  • varnish 2.0.5,
  • varnish 2.0.6
Technical Analysis