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CVE-2017-7657: Eclipse Jetty: Authentication bypass

CVE-2017-7657 is rated critical with a CVSS v3.1 base score of 9.8 and affects Eclipse Jetty, along with 16 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

In Eclipse Jetty, versions 9.2.x and older, 9.3.x (all configurations), and 9.4.x (non-default configuration with RFC2616 compliance enabled), transfer-encoding chunks are handled poorly. The chunk length parsing was vulnerable to an integer overflow. Thus a large chunk size could be interpreted as a smaller chunk size and content sent as chunk body could be interpreted as a pipelined request. If Jetty was deployed behind an intermediary that imposed some authorization and that intermediary allowed arbitrarily large chunks to be passed on unchanged, then this flaw could be used to bypass the authorization imposed by the intermediary as the fake pipelined request would not be interpreted by the intermediary as a 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.

Underlying weakness

CWE-444: Inconsistent Interpretation of HTTP Requests

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

CWE-190: Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Affected products

  • Eclipse Jetty: up to and including 9.2.26; from 9.3.0 before 9.3.24; from 9.4.0 before 9.4.11
  • Debian Linux: 9.0
  • Netapp E Series Santricity Management: all versions listed by NVD
  • Netapp E Series Santricity OS Controller: from 11.0 up to and including 11.50.1
  • Netapp E Series Santricity Web Services: all versions listed by NVD
  • Netapp Element Software: all versions listed by NVD
  • Netapp Element Software Management Node: all versions listed by NVD
  • Netapp Hci Storage Nodes: all versions listed by NVD
  • Netapp Oncommand System Manager: 3.x
  • Netapp Oncommand Unified Manager: before 5.2.4
  • Netapp Santricity Cloud Connector: all versions listed by NVD
  • Netapp Snap Creator Framework: before 4.3.3
  • Netapp Snapcenter: before 4.1p3
  • Netapp Snapmanager: before 3.4.2
  • HP Xp P9000 Command View: from 8.4.0-00 before 8.6.2-00

References