CVE-2025-48995
SignXML's signature verification with HMAC is vulnerable to a timing attack
EPSS 0.24%
描述
SignXML is an implementation of the W3C XML Signature standard in Python. When verifying signatures with X509 certificate validation turned off and HMAC shared secret set (`signxml.XMLVerifier.verify(require_x509=False, hmac_key=...`), versions of SignXML prior to 4.0.4 are vulnerable to a potential timing attack. The verifier may leak information about the correct HMAC when comparing it with the user supplied hash, allowing users to reconstruct the correct HMAC for any data.
如何修補 CVE-2025-48995
要修補 CVE-2025-48995,請將受影響套件升級到下列已修補版本。
- —升級至 4.0.5+dfsg-1 或更新版本
- —升級至 4.0.4 或更新版本
CVE-2025-48995 正在被利用嗎?
低 — EPSS 為 0.2%,目前沒有觀察到大規模利用活動。
受影響套件(2)
- from 0, < 4.0.5+dfsg-1
- from 0, < 4.0.4
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |