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
Status
| Package | Release | Status |
|---|---|---|
|
open-iscsi Launchpad, Ubuntu, Debian |
impish |
Released
(2.1.3-1ubuntu1)
|
| groovy |
Ignored
(end of life)
|
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Released
(2.1.3)
|
|
| hirsute |
Released
(2.1.3-1ubuntu1)
|
|
| focal |
Released
(2.0.874-7.1ubuntu6.4)
|
|
| bionic |
Released
(2.0.874-5ubuntu2.11+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| xenial |
Released
(2.0.873+git0.3b4b4500-14ubuntu3.7+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| jammy |
Released
(2.1.3-1ubuntu1)
|
|
| kinetic |
Released
(2.1.3-1ubuntu1)
|
|
| lunar |
Released
(2.1.3-1ubuntu1)
|
|
|
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
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17437
- https://github.com/open-iscsi/open-iscsi/security/advisories/GHSA-r278-fm99-8rgp
- https://www.forescout.com/company/resources/amnesia33-how-tcp-ip-stacks-breed-critical-vulnerabilities-in-iot-ot-and-it-devices/
- https://ubuntu.com/security/notices/USN-6259-1
- NVD
- Launchpad
- Debian