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4 vulnerabilities found for rfc3161-client by trailofbits
CVE-2026-33753 (GCVE-0-2026-33753)
Vulnerability from nvd – Published: 2026-04-08 14:54 – Updated: 2026-04-08 16:12
VLAI?
Title
Improper Certificate Validation in rfc3161-client
Summary
rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior to 1.0.6, an Authorization Bypass vulnerability in rfc3161-client's signature verification allows any attacker to impersonate a trusted TimeStamping Authority (TSA). By exploiting a logic flaw in how the library extracts the leaf certificate from an unordered PKCS#7 bag of certificates, an attacker can append a spoofed certificate matching the target common_name and Extended Key Usage (EKU) requirements. This tricks the library into verifying these authorization rules against the forged certificate while validating the cryptographic signature against an actual trusted TSA (such as FreeTSA), thereby bypassing the intended TSA authorization pinning entirely. This vulnerability is fixed in 1.0.6.
Severity ?
6.2 (Medium)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| trailofbits | rfc3161-client |
Affected:
< 1.0.6
|
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CVE-2025-52556 (GCVE-0-2025-52556)
Vulnerability from nvd – Published: 2025-06-21 01:33 – Updated: 2025-06-23 15:13
VLAI?
Title
rfc3161-client has insufficient verification for timestamp response signatures
Summary
rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior to version 1.0.3, there is a flaw in the timestamp response signature verification logic. In particular, chain verification is performed against the TSR's embedded certificates up to the trusted root(s), but fails to verify the TSR's own signature against the timestamping leaf certificates. Consequently, vulnerable versions perform insufficient signature validation to properly consider a TSR verified, as the attacker can introduce any TSR signature so long as the embedded leaf chains up to some root TSA. This issue has been patched in version 1.0.3. There is no workaround for this issue.
Severity ?
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| trailofbits | rfc3161-client |
Affected:
< 1.0.3
|
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CVE-2026-33753 (GCVE-0-2026-33753)
Vulnerability from cvelistv5 – Published: 2026-04-08 14:54 – Updated: 2026-04-08 16:12
VLAI?
Title
Improper Certificate Validation in rfc3161-client
Summary
rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior to 1.0.6, an Authorization Bypass vulnerability in rfc3161-client's signature verification allows any attacker to impersonate a trusted TimeStamping Authority (TSA). By exploiting a logic flaw in how the library extracts the leaf certificate from an unordered PKCS#7 bag of certificates, an attacker can append a spoofed certificate matching the target common_name and Extended Key Usage (EKU) requirements. This tricks the library into verifying these authorization rules against the forged certificate while validating the cryptographic signature against an actual trusted TSA (such as FreeTSA), thereby bypassing the intended TSA authorization pinning entirely. This vulnerability is fixed in 1.0.6.
Severity ?
6.2 (Medium)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| trailofbits | rfc3161-client |
Affected:
< 1.0.6
|
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CVE-2025-52556 (GCVE-0-2025-52556)
Vulnerability from cvelistv5 – Published: 2025-06-21 01:33 – Updated: 2025-06-23 15:13
VLAI?
Title
rfc3161-client has insufficient verification for timestamp response signatures
Summary
rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior to version 1.0.3, there is a flaw in the timestamp response signature verification logic. In particular, chain verification is performed against the TSR's embedded certificates up to the trusted root(s), but fails to verify the TSR's own signature against the timestamping leaf certificates. Consequently, vulnerable versions perform insufficient signature validation to properly consider a TSR verified, as the attacker can introduce any TSR signature so long as the embedded leaf chains up to some root TSA. This issue has been patched in version 1.0.3. There is no workaround for this issue.
Severity ?
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| trailofbits | rfc3161-client |
Affected:
< 1.0.3
|
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