Nanopb is a small code-size Protocol Buffers implementation. In Nanopb before versions 0.4.4 and 0.3.9.7, decoding specifically formed message can leak memory if dynamic allocation is enabled and an oneof field contains a static submessage that contains a dynamic field, and the message being decoded contains the submessage multiple times. This is rare in normal messages, but it is a concern when untrusted data is parsed. This is fixed in versions 0.3.9.7 and 0.4.4. The following workarounds are available: 1) Set the option `no_unions` for the oneof field. This will generate fields as separate instead of C union, and avoids triggering the problematic code. 2) Set the type of the submessage field inside oneof to `FT_POINTER`. This way the whole submessage will be dynamically allocated and the problematic code is not executed. 3) Use an arena allocator for nanopb, to make sure all memory can be released afterwards.
References
| Link | Resource |
|---|---|
| https://github.com/nanopb/nanopb/blob/2b48a361786dfb1f63d229840217a93aae064667/CHANGELOG.txt | Release Notes Third Party Advisory |
| https://github.com/nanopb/nanopb/commit/4fe23595732b6f1254cfc11a9b8d6da900b55b0c | Patch Third Party Advisory |
| https://github.com/nanopb/nanopb/issues/615 | Exploit Patch Third Party Advisory |
| https://github.com/nanopb/nanopb/security/advisories/GHSA-85rr-4rh9-hhwh | Third Party Advisory |
Configurations
Configuration 1 (hide)
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History
No history.
Information
Published : 2020-11-25 17:15
Updated : 2024-02-04 21:23
NVD link : CVE-2020-26243
Mitre link : CVE-2020-26243
CVE.ORG link : CVE-2020-26243
JSON object : View
Products Affected
nanopb_project
- nanopb