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4 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
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/XML-Security/signxml/security/… | x_refsource_CONFIRM |
| https://github.com/XML-Security/signxml/commit/1b… | x_refsource_MISC |
Impacted products
1 product
| 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
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/XML-Security/signxml/security/… | x_refsource_CONFIRM |
| https://github.com/XML-Security/signxml/commit/e3… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| XML-Security | signxml |
Affected:
< 4.0.4
|
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CVE-2025-48995 (GCVE-0-2025-48995)
Vulnerability from nvd – 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
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/XML-Security/signxml/security/… | x_refsource_CONFIRM |
| https://github.com/XML-Security/signxml/commit/1b… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| XML-Security | signxml |
Affected:
< 4.0.4
|
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CVE-2025-48994 (GCVE-0-2025-48994)
Vulnerability from nvd – 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
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/XML-Security/signxml/security/… | x_refsource_CONFIRM |
| https://github.com/XML-Security/signxml/commit/e3… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| XML-Security | signxml |
Affected:
< 4.0.4
|
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