Quantum Secular Labs / Blog / Advisories

CVE-2018-1000007: Haxx Curl: Information disclosure

CVE-2018-1000007 is rated critical with a CVSS v3.1 base score of 9.8 and affects Haxx Curl, along with 13 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

libcurl 7.1 through 7.57.0 might accidentally leak authentication data to third parties. When asked to send custom headers in its HTTP requests, libcurl will send that set of headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the `Location:` response header value. Sending the same set of headers to subsequent hosts is in particular a problem for applications that pass on custom `Authorization:` headers, as this header often contains privacy sensitive information or data that could allow others to impersonate the libcurl-using client's request.

Severity breakdown

CVSS v3.1 9.8: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Affected products

  • Haxx Curl: from 7.1 up to and including 7.57.0
  • Debian Linux: 7.0; 8.0; 9.0
  • Canonical Ubuntu Linux: 12.04; 14.04; 16.04; 17.10
  • Red Hat Enterprise Linux Desktop: 7.0
  • Red Hat Enterprise Linux Server: 7.0
  • Red Hat Enterprise Linux Server Aus: 7.4
  • Red Hat Enterprise Linux Server Eus: 7.4; 7.5
  • Red Hat Enterprise Linux Workstation: 7.0
  • Fujitsu M10 1 Firmware: before xcp2361; before xcp3070
  • Fujitsu M10 4 Firmware: before xcp2361; before xcp3070
  • Fujitsu M10 4s Firmware: before xcp2361; before xcp3070
  • Fujitsu M12 1 Firmware: before xcp2361; before xcp3070
  • Fujitsu M12 2 Firmware: before xcp2361; before xcp3070
  • Fujitsu M12 2s Firmware: before xcp2361; before xcp3070

References