CVE Vulnerability

CVE-2021-21401

Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, 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. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds.

5.5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8 / Impact : 4.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

7.1 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References
Link Resource
https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88 Exploit Patch
https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261 Patch Third Party Advisory
https://github.com/nanopb/nanopb/issues/647 Exploit Issue Tracking
https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1 Release Notes Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:nanopb_project:nanopb:*:*:*:*:*:*:*:*
cpe:2.3:a:nanopb_project:nanopb:*:*:*:*:*:*:*:*
Information

Published : 2021-03-23 06:15

Updated : 2021-03-29 02:50

NVD link : CVE-2021-21401

Mitre link : CVE-2021-21401

Products Affected
No products.
CWE
CWE-763