Bug 1771496 (CVE-2019-18805) - CVE-2019-18805 kernel: integer overflow in tcp_ack_update_rtt in net/ipv4/tcp_input.c
Summary: CVE-2019-18805 kernel: integer overflow in tcp_ack_update_rtt in net/ipv4/tcp...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-18805
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1771498 1773862 1773863 1773864
Blocks: 1771499
TreeView+ depends on / blocked
 
Reported: 2019-11-12 13:37 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 21:04 UTC (History)
48 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was reported in the Linux kernel's TCP subsystem while calculating a packet round trip time, when a sysctl parameter (/proc/sys/net/ipv4/tcp_min_rtt_wlen) is set incorrectly. This causes an integer overflow which can lead to a denial Of service (DOS) attack.
Clone Of:
Environment:
Last Closed: 2020-03-09 16:31:54 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:2052 0 None None None 2020-05-11 12:53:52 UTC
Red Hat Product Errata RHBA-2020:2626 0 None None None 2020-06-19 01:50:00 UTC
Red Hat Product Errata RHSA-2020:0740 0 None None None 2020-03-09 14:32:06 UTC
Red Hat Product Errata RHSA-2020:1567 0 None None None 2020-04-28 15:25:12 UTC
Red Hat Product Errata RHSA-2020:1769 0 None None None 2020-04-28 15:51:40 UTC

Description Guilherme de Almeida Suckevicz 2019-11-12 13:37:41 UTC 
A flaw was reported in kernel TCP subsystem while calculating a packet round trip time, when a sysctl parameter (/proc/sys/net/ipv4/tcp_min_rtt_wlen) when is set wrongly. This causes an integer over flaw which can lead to a Denial Of Service (DOS) attack.  


Additional Information:
-----------------------
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19fad20d15a6494f47f85d869f00b11343ee5c78
Comment 1 Guilherme de Almeida Suckevicz 2019-11-12 13:38:05 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1771498]
Comment 2 Justin M. Forbes 2019-11-12 18:08:36 UTC 
This was fixed for Fedora with the 5.0.11 stable kernel updates.
Comment 7 Eric Christensen 2019-11-20 16:44:11 UTC 
Mitigation:

This flaw can be mitigated by setting the sysctl parameter (/proc/sys/net/ipv4/tcp_min_rtt_wlen) with 300 which means the packet time will not exceed more then 5 minutes and which should not cause an integer overflow.
Comment 8 errata-xmlrpc 2020-03-09 14:31:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:0740 https://access.redhat.com/errata/RHSA-2020:0740
Comment 9 Product Security DevOps Team 2020-03-09 16:31:54 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-18805
Comment 10 errata-xmlrpc 2020-04-28 15:25:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:1567 https://access.redhat.com/errata/RHSA-2020:1567
Comment 11 errata-xmlrpc 2020-04-28 15:51:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:1769 https://access.redhat.com/errata/RHSA-2020:1769
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