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Advisories

Scapy before 2.8.0 Uncontrolled Recursion DoS via BER SEQUENCE Decoder

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Severity
medium
Date
Affecting

  • scapy >= 0, < 2.8.0

CWE
  • CWE-674 Uncontrolled Recursion
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
infycore
Description
Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.

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