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CVE-2020-26243

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-6121-1
Posted May 30, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6121-1 - It was discovered that Nanopb incorrectly handled certain decode messages. An attacker could possibly use this cause a denial of service or expose sensitive information. It was discovered that Nanopb incorrectly handled certain decode messages. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2020-26243, CVE-2021-21401
SHA-256 | 70aba3d5f351642efd33d4a90d4c7a283322101c6801955823fd4124f653d158
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