Upstream information

CVE-2016-6581 at MITRE

Description

A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targeted for a denial of service attack, specifically a so-called "HPACK Bomb" attack. This attack occurs when an attacker inserts a header field that is exactly the size of the HPACK dynamic header table into the dynamic header table. The attacker can then send a header block that is simply repeated requests to expand that field in the dynamic table. This can lead to a gigantic compression ratio of 4,096 or better, meaning that 16kB of data can decompress to 64MB of data on the target machine.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having important severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 7.8
Vector AV:N/AC:L/Au:N/C:N/I:N/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete
CVSS v3 Scores
  National Vulnerability Database
Base Score 7.5
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Access Vector Network
Access Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
CVSSv3 Version 3
No SUSE Bugzilla entries cross referenced.

No SUSE Security Announcements cross referenced.

List of released packages

Product(s) Fixed package version(s) References
SUSE Linux Enterprise High Performance Computing 15 SP3
SUSE Linux Enterprise Module for Server Applications 15 SP3
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise Server for SAP Applications 15 SP3
SUSE Linux Enterprise Storage 7.1
SUSE Manager Proxy 4.2
SUSE Manager Retail Branch Server 4.2
SUSE Manager Server 4.2
  • python3-hpack >= 3.0.0-3.2.1
Patchnames:
SUSE Linux Enterprise Module for Server Applications 15 SP3 GA python3-hpack-3.0.0-3.2.1
SUSE Linux Enterprise High Performance Computing 15 SP4
SUSE Linux Enterprise Module for Server Applications 15 SP4
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15 SP4
SUSE Manager Proxy 4.3
SUSE Manager Retail Branch Server 4.3
SUSE Manager Server 4.3
  • python3-hpack >= 3.0.0-3.2.1
Patchnames:
SUSE Linux Enterprise Module for Server Applications 15 SP4 GA python3-hpack-3.0.0-3.2.1
openSUSE Tumbleweed
  • python36-hpack >= 4.0.0-1.6
  • python38-hpack >= 4.0.0-1.6
  • python39-hpack >= 4.0.0-1.6
Patchnames:
openSUSE Tumbleweed GA python36-hpack-4.0.0-1.6


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
SUSE Linux Enterprise High Performance Computing 15 SP2 python-hpack Already fixed
SUSE Linux Enterprise Module for Server Applications 15 SP2 python-hpack Already fixed
SUSE Linux Enterprise Server 15 SP2 python-hpack Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP2 python-hpack Already fixed
SUSE Linux Enterprise Storage 7 python-hpack Already fixed
SUSE Manager Proxy 4.1 python-hpack Already fixed
SUSE Manager Retail Branch Server 4.1 python-hpack Already fixed
SUSE Manager Server 4.1 python-hpack Already fixed