Bug 1899855 (CVE-2020-17437)

Summary:	CVE-2020-17437 Open-iSCSI: invalid handing of the TCP urgent data pointer
Product:	[Other] Security Response	Reporter:	Cedric Buissart <cbuissar>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	andy, cleech, coughlan, dlehman, security-response-team, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-29 06:59:30 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1899973, 1899978, 1909061, 1910569
Bug Blocks:	1881303

Description Cedric Buissart 2020-11-20 09:03:07 UTC

A missing boundary check was found in uIP (Micro IP) TCP packet processing

When handling TCP Urgent data, there are no sanity checks for the value of the Urgent data pointer, allowing attackers to corrupt memory by supplying arbitrary Urgent data pointer offsets within TCP packets.

Listed potential impact: DoS

Comment 2 Cedric Buissart 2020-12-10 10:32:45 UTC

External References:

https://www.forescout.com/company/resources/amnesia33-how-tcp-ip-stacks-breed-critical-vulnerabilities-in-iot-ot-and-it-devices/

Comment 4 Cedric Buissart 2020-12-10 16:27:16 UTC

In Red Hat Enterprise Linux, uIP is used in the iscsiuio command, provided by iscsi-initiator-utils.

In RHEL, the command is used for connecting to an iSCSI NAS. It is expected that the attacker is a Person in the Middle, between the NAS and the RHEL machine.
As a consequence, this issue is currently rated Low.

Comment 6 Cedric Buissart 2020-12-18 09:13:45 UTC

Created iscsi-initiator-utils tracking bugs for this issue:

Affects: fedora-all [bug 1909061]