Ubuntu Security Notice 2676-1 - It was discovered that NBD incorrectly handled IP address matching. A remote attacker could use this issue with an IP address that has a partial match and bypass access restrictions. This issue only affected Ubuntu 12.04 LTS. Tuomas discovered that NBD incorrectly handled wrong export names and closed connections during negotiation. A remote attacker could use this issue to cause NBD to crash, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS. Various other issues were also addressed.
0cfef8765233ddb6db3ab0a1c9ceb17aa66f3140b82421a3ebb1288b1ef8d9c9Debian Linux Security Advisory 3271-1 - Tuomas Rasanen discovered that unsafe signal handling in nbd-server, the server for the Network Block Device protocol, could allow remote attackers to cause a deadlock in the server process and thus a denial of service.
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