CVE-2021-21401
Published: 23 March 2021
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.
Priority
Status
Package | Release | Status |
---|---|---|
nanopb Launchpad, Ubuntu, Debian |
focal |
Released
(0.4.1-1ubuntu0.1~esm1)
Available with Ubuntu Pro |
groovy |
Ignored
(end of life)
|
|
hirsute |
Ignored
(end of life)
|
|
impish |
Ignored
(end of life)
|
|
jammy |
Not vulnerable
(0.4.5-2)
|
|
upstream |
Released
(0.4.5)
|
|
xenial |
Does not exist
|
|
bionic |
Does not exist
|
|
trusty |
Does not exist
|
|
kinetic |
Not vulnerable
(0.4.6-1)
|
|
lunar |
Not vulnerable
(0.4.6-1)
|
|
mantic |
Not vulnerable
(0.4.6-1)
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.1 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | High |
Availability impact | Low |
Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21401
- https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88
- https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261
- https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1
- https://github.com/nanopb/nanopb/issues/647
- https://ubuntu.com/security/notices/USN-6121-1
- NVD
- Launchpad
- Debian