CVE-2020-15112

In etcd before versions 3.3.23 and 3.4.10, it is possible to have an entry index greater then the number of entries in the ReadAll method in wal/wal.go. This could cause issues when WAL entries are being read during consensus as an arbitrary etcd consensus participant could go down from a runtime panic when reading the entry.

In etcd before versions 3.3.23 and 3.4.10, it is possible to have an entry index greater then the number of entries in the ReadAll method in wal/wal.go. This could cause issues when WAL entries are being read during consensus as an arbitrary etcd consensus participant could go down from a runtime panic when reading the entry.

Malformed WALs can be constructed such that WAL.ReadAll can cause attempted out of bounds reads, or creation of arbitrarily sized slices, which may be used as a DoS vector.

### Vulnerability type Data Validation ### Detail In the ReadAll method in wal/wal.go, it is possible to have an entry index greater then the number of entries. This could cause issues when WAL entries are being read during consensus as an arbitrary etcd consensus participant could go down from a runtime panic when reading the entry. ### References Find out more on this vulnerability in the [security audit report](https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf) ### For more information If you have any questions or comments about this advisory: * Contact the [etcd security committee](https://github.com/etcd-io/etcd/blob/master/security/security-release-process.md)

En etcd versiones anteriores a 3.3.23 y 3.4.10, es posible tener un índice de entrada mayor que el número de entradas en el método ReadAll en el archivo wal/wal.go. Esto podría causar problemas cuando las entradas de WAL se leen durante el consenso, ya que un participante arbitrario del consenso etcd, podría descender a partir de un pánico en tiempo de ejecución cuando lee la entrada