CVE-2023-5215: Libnbd: crash or misbehaviour when nbd server returns an unexpected block size
First published: Wed Sep 27 2023(Updated: )
A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/libnbd | <1.18.0 | 1.18.0 |
| <1.18.0 | ||
| =8.0 | ||
| =9.0 | ||
| Redhat Libnbd | <1.18.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2023-5215?
CVE-2023-5215 is a vulnerability found in libnbd that allows a server to reply with a block size larger than 2^63, leading to potential application crashes or unintended behavior for NBD clients.
What is the severity of CVE-2023-5215?
The severity of CVE-2023-5215 is medium, with a severity value of 5.3.
How does CVE-2023-5215 affect libnbd?
CVE-2023-5215 affects libnbd by allowing a server to respond with an oversized block size, which can cause issues in NBD clients that do not handle the returned value properly.
How can I fix CVE-2023-5215?
To fix CVE-2023-5215, update libnbd to version 1.18.0 or later, provided by the Red Hat package.
Where can I find more information about CVE-2023-5215?
You can find more information about CVE-2023-5215 in the following references: - [Red Hat Security Advisory](https://access.redhat.com/security/cve/CVE-2023-5215) - [Red Hat Bugzilla](https://bugzilla.redhat.com/show_bug.cgi?id=2241041) - [libguestfs Mailing List](https://listman.redhat.com/archives/libguestfs/2023-September/032635.html)
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