Vulnerability Name:

CVE-2020-17439 (CCN-192756)

Assigned:2020-12-08
Published:2020-12-08
Updated:2020-12-15
Summary:An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that the incoming DNS replies match outgoing DNS queries in newdata() in resolv.c. Also, arbitrary DNS replies are parsed if there was any outgoing DNS query with a transaction ID that matches the transaction ID of an incoming reply. Provided that the default DNS cache is quite small (only four records) and that the transaction ID has a very limited set of values that is quite easy to guess, this can lead to DNS cache poisoning.
CVSS v3 Severity:8.3 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L)
7.3 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): Low
7.0 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L)
6.2 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): Low
Availibility (A): Low
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
6.6 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:C/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Partial
Availibility (A): Partial
Vulnerability Type:CWE-20
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-17439

Source: CCN
Type: US-CERT VU#815128
Embedded TCP/IP stacks have memory corruption vulnerabilities

Source: XF
Type: UNKNOWN
tcpipstacks-cve202017439-sec-bypass(192756)

Source: CCN
Type: uip GIT Repository
uIP

Source: CCN
Type: ICSA-20-343-01
Multiple Embedded TCP/IP Stacks

Source: MISC
Type: Third Party Advisory, US Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01

Source: CCN
Type: Forescout Web site
AMNESIA:33

Source: MISC
Type: Third Party Advisory, US Government Resource
https://www.kb.cert.org/vuls/id/815128

Vulnerable Configuration:Configuration 1:
  • cpe:/a:uip_project:uip:1.0:*:*:*:*:*:*:*
  • AND
  • cpe:/o:contiki-os:contiki:3.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    uip_project uip 1.0
    contiki-os contiki 3.0