Multiple vulnerabilities in uIP and Contiki OS

1) Out-of-bounds write

EUVDB-ID: #VU59115

Risk: Critical

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-17437

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing TCP packets with Urgent flag. A remote attacker can send specially crafted traffic to the system, trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

uIP: 1.0

Contiki OS: 3.0

External links

http://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf
http://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
http://www.kb.cert.org/vuls/id/815128

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Out-of-bounds write

EUVDB-ID: #VU59116

Risk: Critical

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-17438

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing IP packets. The code that reassembles fragmented packets fails to properly validate the total length of an incoming packet specified in its IP header, as well as the fragmentation offset value specified in the IP header. A remote attacker can send specially crafted IP packets to the system, trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

uIP: 1.0

Contiki OS: 3.0

External links

http://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
http://www.kb.cert.org/vuls/id/815128

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Out-of-bounds read

EUVDB-ID: #VU59117

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-13987

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in the uIP TCP/IP Stack component when calculating the checksums for IP packets in upper_layer_chksum in net/ipv4/uip.c. A remote attacker can send specially crafted traffic to the system, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Contiki OS: 3.0

uIP: 1.0

External links

http://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf
http://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
http://www.kb.cert.org/vuls/id/815128

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.