CVE-2023-33975: RIOT-OS vulnerable to Out of Bounds Write in _rbuf_add
First published: Tue May 30 2023(Updated: )
RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In version 2023.01 and prior, an attacker can send a crafted frame to the device resulting in an out of bounds write in the packet buffer. The overflow can be used to corrupt other packets and the allocator metadata. Corrupting a pointer will easily lead to denial of service. While carefully manipulating the allocator metadata gives an attacker the possibility to write data to arbitrary locations and thus execute arbitrary code. This issue is fixed in pull request 19680. As a workaround, disable support for fragmented IP datagrams.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Riot-os Riot | <=2023.01 |
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Reference Links
- https://github.com/RIOT-OS/RIOT/commit/1aeb90ee5555ae78b567a6365ae4ab71bfd1404b
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L388
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L320
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L463
- https://github.com/RIOT-OS/RIOT/pull/19680
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L467
- https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-f6ff-g7mh-58q4
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L480
Frequently Asked Questions
What is the severity of CVE-2023-33975?
CVE-2023-33975 has been classified as a high severity vulnerability due to its potential for causing an out of bounds write in the packet buffer.
How do I fix CVE-2023-33975?
To mitigate CVE-2023-33975, upgrade to a version of RIOT-OS later than 2023.01 which addresses this vulnerability.
What are the potential impacts of CVE-2023-33975?
CVE-2023-33975 may allow attackers to exploit the vulnerability to cause denial of service or potentially execute arbitrary code.
Which versions of RIOT-OS are affected by CVE-2023-33975?
CVE-2023-33975 affects RIOT-OS versions up to and including 2023.01.
Can CVE-2023-33975 be exploited remotely?
Yes, CVE-2023-33975 can be exploited remotely through specially crafted 6LoWPAN frames sent to the vulnerable device.
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