Vulnerability Details : CVE-2020-17439
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.
Vulnerability category: Input validation
Products affected by CVE-2020-17439
- cpe:2.3:a:uip_project:uip:1.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-17439
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 46 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-17439
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
8.3
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L |
3.9
|
3.7
|
NIST |
CWE ids for CVE-2020-17439
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-17439
-
https://www.kb.cert.org/vuls/id/815128
VU#815128 - Embedded TCP/IP stacks have memory corruption vulnerabilitiesThird Party Advisory;US Government Resource
-
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
Multiple Embedded TCP/IP Stacks | CISAThird Party Advisory;US Government Resource
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