ZcashFoundation Zebra 6.4.0 before 6.4.2 parses version 6 transactions carrying a pre-NU6.3 consensus branch ID, but the size computation during UnminedTx construction treats re-serialization of the Orchard bundle as infallible, so the resulting error trips an expect that aborts zebrad. Unauthenticated peers can send a single pre-handshake tx message to crash the node, and can repeat this after each restart.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Zfnd Zebra
cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*
|
6.4.0
|
6.4.2
|
References 3
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h5rr-8pqv-grp9
GitHub Security Advisory (GHSA-h5rr-8pqv-grp9)
https://github.com/ZcashFoundation/zebra/commit/008abac5c99e872f283450d596d95e3…
Patch Commit
https://www.vulncheck.com/advisories/zebra-6.4.0-before-6.4.2-denial-of-service…
VulnCheck Advisory: Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction