Description (CNA)
Zeek before 8.0.9 contains a null pointer dereference vulnerability in its Kerberos protocol analyzer that allows unauthenticated remote attackers to crash the sensor by sending a crafted KRB_ERROR message with error-code 25 (KDC_ERR_PREAUTH_REQUIRED) containing a PA-DATA element with padata-type 2, 3, 11, or 19. Attackers can exploit a parser and analyzer state mismatch where proc_padata() dereferences an uninitialized pa_data_element field selected by the wrong parsing arm, triggering a crash via a single UDP or TCP packet to port 88 without any credentials or prior authentication.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| zeek / zeek | affected 0 before 8.0.9 |
CWE
CWE-476
References
- https://github.com/zeek/zeek/releases/tag/v8.0.9
- https://github.com/zeek/zeek/commit/c82e3c734893d932e94310aec0dbeb1ffcea169d
- https://www.vulncheck.com/advisories/zeek-null-pointer-dereference-dos-via-kerberos-krb-error-parsing
ADP enrichment
No English description supplied.
No references supplied.