Denial of Service (DoS) Affecting libguestfs/libnbd package, versions [1.17.4,1.18.2)[1.19.0,1.19.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published1 Nov 2023
- disclosed31 Oct 2023
- creditRich Jones
Introduced: 31 Oct 2023
CVE-2023-5871 (opens in a new tab)How to fix?
Upgrade libguestfs/libnbd to version 1.18.2, 1.19.2 or higher.
Overview
Affected versions of this package are vulnerable to Denial of Service (DoS). The NBD protocol states that a client can negotiate with a server to enable 64-bit extended headers; when this negotiation is done, a server's reply to NBD_CMD_BLOCK_STATUS can include a flag field that does not fit in 32 bits. We recently added the nbd_block_status_64(3) API to libnbd to handle such server replies gracefully (exposing the full 64-bit reply to the application); but if an application still uses the older 32-bit nbd_block_status() API when the server sends a large flag value, a flaw in libnbd meant that the library could die with an assertion failure triggered by the server, rather than raising an OVERFLOW error to indicate that the server's reply could not fit in the space provided by the application's choice of API.
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
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