CVE-2020-26243
Severity CVSS v4.0:
Pending analysis
Type:
CWE-119
Buffer Errors
Publication date:
25/11/2020
Last modified:
07/12/2020
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.
Impact
Base Score 3.x
7.50
Severity 3.x
HIGH
Base Score 2.0
4.30
Severity 2.0
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:nanopb_project:nanopb:*:*:*:*:*:*:*:* | 0.3.9.7 (excluding) | |
| cpe:2.3:a:nanopb_project:nanopb:*:*:*:*:*:*:*:* | 0.4.0 (including) | 0.4.4 (excluding) |
To consult the complete list of CPE names with products and versions, see this page