CVE-2021-21401

描述

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.

如何修補 CVE-2021-21401

要修補 CVE-2021-21401,請將受影響套件升級到下列已修補版本。

• —升級至 0.3.9.8 或更新版本

CVE-2021-21401 正在被利用嗎?

低 — EPSS 為 1.8%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 0.3.2, < 0.3.9.8

CVSS 分數

參考連結(8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-21401
• PATCHgithub.com/nanopb/nanopb
• WEBgithub.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1
• WEBgithub.com/nanopb/nanopb/commit/4a375a560651a86726e5283be85a9231fd0efe9c