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Ubuntu: (Multiple Advisories) (CVE-2020-26243): Nanopb vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2020-26243): Nanopb vulnerabilities

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:N/A:P)
Published
11/25/2020
Created
05/31/2023
Added
05/31/2023
Modified
05/31/2023

Description

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.

Solution(s)

  • ubuntu-upgrade-nanopb

References

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