CVE-2020-17437

Published: 1 December 2020

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. When the Urgent flag is set in a TCP packet, and the stack is configured to ignore the urgent data, the stack attempts to use the value of the Urgent pointer bytes to separate the Urgent data from the normal data, by calculating the offset at which the normal data should be present in the global buffer. However, the length of this offset is not checked; therefore, for large values of the Urgent pointer bytes, the data pointer can point to memory that is way beyond the data buffer in uip_process in uip.c.

Notes

Author	Note
sbeattie	aka FSCT-2020-0018 issue in embedded copy of uIP
mdeslaur	per upstream "iscsiuio only uses uip for network "services", such as DHCP, ARP, etc, and not for normal TCP/IP communications"

Priority

Cvss 3 Severity Score

8.2

Score breakdown

Status

Package	Release	Status
open-iscsi Launchpad, Ubuntu, Debian	bionic	Released (2.0.874-5ubuntu2.11+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	focal	Released (2.0.874-7.1ubuntu6.4)
	groovy	Ignored (end of life)
	hirsute	Released (2.1.3-1ubuntu1)
	impish	Released (2.1.3-1ubuntu1)
	jammy	Released (2.1.3-1ubuntu1)
	kinetic	Released (2.1.3-1ubuntu1)
	lunar	Released (2.1.3-1ubuntu1)
	trusty	Not vulnerable (code not present)
	upstream	Released (2.1.3)
	xenial	Released (2.0.873+git0.3b4b4500-14ubuntu3.7+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	Patches: upstream: https://github.com/open-iscsi/open-iscsi/commit/d63ce0d64c5abe9f285f14ce394660bfb9a16538

Severity score breakdown

Parameter	Value
Base score	8.2
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References

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