CVE-2021-33913
描述
libspf2 before 1.2.11 has a 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 SPF_record_expand_data in spf_expand.c. The amount of overflowed data depends on the relationship between the length of an entire domain name and the length of its leftmost label. 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-2021-33913
要修補 CVE-2021-33913,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
CVE-2021-33913 正在被利用嗎?
中等 — EPSS 為 9.6%,可持續追蹤但非最高優先。
受影響套件(2)
- from 0, < 1.2.11-r0
- from 0, < 1.2.10-7.1~deb11u1
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 |