CVE-2021-33912
libspf2 - security update
9.8
CRITICAL
CVSS 3.1
EPSS 1.3%
描述
libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to execute arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a crafted SPF DNS record, because of incorrect sprintf usage in SPF_record_expand_data in spf_expand.c. The vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2 with Postfix; older versions of spfquery relied on libspf2) but most often is not.
如何修補 CVE-2021-33912
要修補 CVE-2021-33912,請將受影響套件升級到下列已修補版本。
- —升級至 1.2.11-r0 或更新版本
- —升級至 1.2.10-7.1~deb11u1 或更新版本
- —升級至 1.2.10-7+deb9u2 或更新版本
CVE-2021-33912 正在被利用嗎?
低 — EPSS 為 1.3%,目前沒有觀察到大規模利用活動。
受影響套件(3)
- from 0, < 1.2.11-r0
- from 0, < 1.2.10-7.1~deb11u1
- from 0, < 1.2.10-7+deb9u2
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |