CVE-2020-17437

Publication date 1 December 2020

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

8.2 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
open-iscsi 23.04 lunar
Fixed 2.1.3-1ubuntu1
22.10 kinetic
Fixed 2.1.3-1ubuntu1
22.04 LTS jammy
Fixed 2.1.3-1ubuntu1
21.10 impish
Fixed 2.1.3-1ubuntu1
21.04 hirsute
Fixed 2.1.3-1ubuntu1
20.10 groovy Ignored end of life
20.04 LTS focal
Fixed 2.0.874-7.1ubuntu6.4
18.04 LTS bionic
16.04 LTS xenial
14.04 LTS trusty
Not affected

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Notes

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"

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
open-iscsi

Severity score breakdown

Parameter Value
Base score 8.2 · High
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