PT-2025-26485 · Unknown · Rfc3161-Client

Woodruffw · Published 2025-06-20 · Updated 2025-07-03 · CVE-2025-52556

Positive Technologies (AI Summary)

CVSS v4.0

9.3

Critical

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions: rfc3161-client versions prior to 1.0.3

Description: The issue is related to a flaw in the timestamp response signature verification logic. Specifically, the chain verification is performed against the TSR's embedded certificates up to the trusted root(s), but it fails to verify the TSR's own signature against the timestamping leaf certificates. This allows an attacker to introduce any TSR signature as long as the embedded leaf chains up to some root TSA, resulting in insufficient signature validation.

Recommendations: For versions prior to 1.0.3, update to version 1.0.3 to resolve the issue. As a temporary workaround, consider restricting the use of the timestamp response signature verification logic until a patch is available.

Exploit

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2025-52556

GHSA-6QHV-4H7R-2G9M

OPENSUSE-SU-2025:15282-1

Affected Products

Rfc3161-Client

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/52xxx/CVE-2025-52556.json · Exploit
• https://osv.dev/vulnerability/CVE-2025-52556 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-6qhv-4h7r-2g9m · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:15282-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-52556 · Security Note
• https://github.com/trailofbits/rfc3161-client · Note
• https://github.com/trailofbits/rfc3161-client/security/advisories/GHSA-6qhv-4h7r-2g9m · Note
• https://github.com/trailofbits/rfc3161-client/commit/724a184f953e3f171f85cb223871172b41b0d0dc · Note
• https://twitter.com/VulmonFeeds/status/1936325847608082718 · Twitter Post
• https://t.me/latest_high_impact_cve/2748 · Telegram Post
• https://twitter.com/CVEnew/status/1936472504672952347 · Twitter Post
• https://twitter.com/CCBalert/status/1937159754498904167 · Twitter Post
• https://t.me/cvenotify/126330 · Telegram Post
• https://suse.com/security/cve/CVE-2025-52556 · Note
• https://t.me/cvetracker/26727 · Telegram Post