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2 vulnerabilities by XML-Security

CVE-2025-48995 (GCVE-0-2025-48995)

Vulnerability from cvelistv5 – Published: 2025-06-02 16:23 – Updated: 2025-06-02 16:41
VLAI?
Title
SignXML's signature verification with HMAC is vulnerable to a timing attack
Summary
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.
Severity ?
6.9 (Medium)
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
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
References
Impacted products
Vendor Product Version
XML-Security signxml Affected: < 4.0.4
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CVE-2025-48994 (GCVE-0-2025-48994)

Vulnerability from cvelistv5 – Published: 2025-06-02 16:22 – Updated: 2025-06-02 16:30
VLAI?
Title
SignXML's signature verification with HMAC is vulnerable to an algorithm confusion attack
Summary
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 algorithm confusion attack. Unless the user explicitly limits the expected signature algorithms using the `signxml.XMLVerifier.verify(expect_config=...)` setting, an attacker may supply a signature unexpectedly signed with a key other than the provided HMAC key, using a different (asymmetric key) signature algorithm. Starting with SignXML 4.0.4, specifying `hmac_key` causes the set of accepted signature algorithms to be restricted to HMAC only, if not already restricted by the user.
Severity ?
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
Impacted products
Vendor Product Version
XML-Security signxml Affected: < 4.0.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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