A vulnerability has been found in open-iscsi up to 2.0.875 and classified as problematic. This vulnerability affects the function process_iscsid_broadcast of the file iscsiuio/src/unix/iscsid_ipc.c of the component iscsiuio Server. The manipulation as part of a Messages leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in Open-iSCSI through 2.0.875. A local attacker can cause the iscsiuio server to abort or potentially execute code by sending messages with incorrect lengths, which (due to lack of checking) can lead to buffer overflows, and result in aborts (with overflow checking enabled) or code execution. The process_iscsid_broadcast function in iscsiuio/src/unix/iscsid_ipc.c does not validate the payload length before a write operation.

The bug was discovered 12/22/2017. The weakness was released 12/27/2017 (Website). The advisory is available at openwall.com. This vulnerability was named CVE-2017-17840 since 12/22/2017. Local access is required to approach this attack. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• open-iscsi

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• 2.0.875

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CPE 2.2info

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