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Advisories

MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()

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severity
high
date
Affecting

  • krb5 <= 1.22.2

CWE
  • CWE-476 NULL Pointer Dereference
CVSS
7.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Tristan Madani
Description
MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service.

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