CVE-2020-24340
First published: Fri Dec 11 2020(Updated: )
An issue was discovered in picoTCP and picoTCP-NG through 1.7.0. The code that processes DNS responses in pico_mdns_handle_data_as_answers_generic() in pico_mdns.c does not check whether the number of answers/responses specified in a DNS packet header corresponds to the response data available in the packet, leading to an out-of-bounds read, invalid pointer dereference, and Denial-of-Service.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Altran picoTCP | <=1.7.0 | |
| Altran Picotcp-ng | <=1.7.0 | |
| Multiple (open source) picoTCP-NG, Version 1.7.0 and prior | ||
| Multiple (open source) picoTCP (EOL), Version 1.7.0 and prior | ||
| Multiple (open source) FNET, Version 4.6.3 | ||
| Multiple (open source) Nut/Net, Version 5.1 and prior |
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Reference Links
Frequently Asked Questions
What is CVE-2020-24340?
CVE-2020-24340 is a vulnerability in picoTCP and picoTCP-NG through 1.7.0 that allows an attacker to bypass security restrictions via a crafted DNS packet.
How does CVE-2020-24340 affect Altran picoTCP and Altran Picotcp-ng?
CVE-2020-24340 affects Altran picoTCP and Altran Picotcp-ng versions up to and including 1.7.0.
What is the severity of CVE-2020-24340?
CVE-2020-24340 has a severity rating of 7.5 (high).
How can an attacker exploit CVE-2020-24340?
An attacker can exploit CVE-2020-24340 by sending a crafted DNS packet with a mismatch between the number of answers specified in the packet header and the actual response data.
Is there a fix available for CVE-2020-24340?
Yes, users should update to a version of picoTCP or picoTCP-NG that is higher than 1.7.0 to fix CVE-2020-24340.
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- canonical/multiple (open source) picotcp-ng, version 1.7.0 and prior
- canonical/multiple (open source) picotcp (eol), version 1.7.0 and prior
- canonical/multiple (open source) fnet, version 4.6.3
- canonical/multiple (open source) nut/net, version 5.1 and prior