PT-2021-14478 · Nanopb+2 · Nanopb+2

Petteri Aimonen · Published 2021-03-23 · Updated 2024-08-30 · CVE-2021-21401

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Name of the Vulnerable Software and Affected Versions Nanopb versions prior to 0.3.9.8 and 0.4.5

Description Decoding a specifically formed message can cause invalid free() or realloc() calls if the message type contains an oneof field, and the oneof directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed.

Recommendations For versions prior to 0.3.9.8, update to version 0.3.9.8. For versions prior to 0.4.5, update to version 0.4.5. As a temporary workaround, consider setting the option no unions for the oneof field to generate fields as separate instead of C union, which avoids triggering the problematic code. Alternatively, set the type of all fields inside the oneof to FT POINTER to ensure that the data contained inside the union is always a valid pointer. Heap implementations that guard against invalid free() provide a partial mitigation.

Exploit

Fix

Weakness Enumeration

CWE-763

Related Identifiers

CVE-2021-21401

GHSA-7MV5-5MXH-QG88

OPENSUSE-SU-2024:11074-1

PYSEC-2021-432

USN-6121-1

Affected Products

Linuxmint

Nanopb

Ubuntu

References · 24

• 🔥 https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88 · Exploit
• 🔥 https://github.com/nanopb/nanopb/issues/647 · Exploit
• https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-21401 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2024:11074-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-21401 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-21401 · Vendor Advisory
• https://osv.dev/vulnerability/USN-6121-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-21401 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-6121-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-26243 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-21401 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-21401 · Security Note
• https://osv.dev/vulnerability/GHSA-7mv5-5mxh-qg88 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-21401 · Vendor Advisory