CVE-2020-26243 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2020-26243 Interim 1 4 2025-02-17T01:12:47Z current 2021-09-30T01:32:54Z 2025-02-17T01:12:47Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2020-26243 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. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://www.suse.com/support/security/rating/ SUSE Security Ratings openSUSE Tumbleweed libprotobuf-nanopb0-0.4.5-1.3 nanopb-devel-0.4.5-1.3 nanopb-source-0.4.5-1.3 libprotobuf-nanopb0-0.4.5-1.3 as a component of openSUSE Tumbleweed nanopb-devel-0.4.5-1.3 as a component of openSUSE Tumbleweed nanopb-source-0.4.5-1.3 as a component of openSUSE Tumbleweed 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. CVE-2020-26243 openSUSE Tumbleweed:libprotobuf-nanopb0-0.4.5-1.3 openSUSE Tumbleweed:nanopb-devel-0.4.5-1.3 openSUSE Tumbleweed:nanopb-source-0.4.5-1.3 important 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H