CVE-2024-2494: Libvirt: negative g_new0 length can lead to unbounded memory allocation
First published: Mon Mar 18 2024(Updated: )
A flaw was found in the RPC library APIs of libvirt. The RPC server deserialization code allocates memory for arrays before the non-negative length check is performed by the C API entry points. Passing a negative length to the g_new0 function results in a crash due to the negative length being treated as a huge positive number. This flaw allows a local, unprivileged user to perform a denial of service attack by causing the libvirt daemon to crash.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/libvirt | <6.0.0-0ubuntu8.19 | 6.0.0-0ubuntu8.19 |
| ubuntu/libvirt | <8.0.0-1ubuntu7.10 | 8.0.0-1ubuntu7.10 |
| ubuntu/libvirt | <9.6.0-1ubuntu1.1 | 9.6.0-1ubuntu1.1 |
| ubuntu/libvirt | <10.0.0-2ubuntu8.1 | 10.0.0-2ubuntu8.1 |
| debian/libvirt | <=5.0.0-4+deb10u1<=7.0.0-3+deb11u2<=9.0.0-4 | 5.0.0-4+deb10u2 10.2.0-1 10.3.0-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2024-2494
- https://ubuntu.com/security/notices/USN-6734-1
- https://ubuntu.com/security/notices/USN-6734-2
- https://nvd.nist.gov/vuln/detail/CVE-2024-2494
- https://launchpad.net/bugs/cve/CVE-2024-2494
- https://security-tracker.debian.org/tracker/CVE-2024-2494
- https://gitlab.com/libvirt/libvirt/-/commit/8a3f8d957507c1f8223fdcf25a3ff885b15557f2
- https://ubuntu.com/security/CVE-2024-2494
- https://access.redhat.com/errata/RHSA-2024:2560
- https://access.redhat.com/security/cve/CVE-2024-2494
- https://bugzilla.redhat.com/show_bug.cgi?id=2270115
- https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
- https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/BKRQXPLPC6B7FLHJXSBQYW7HNDEBW6RJ/
- https://access.redhat.com/errata/RHSA-2024:3253
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2270649
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2270115#c3
- https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/
- https://monopolygo.io/
- https://security.netapp.com/advisory/ntap-20240517-0009/
Frequently Asked Questions
What is the severity of CVE-2024-2494?
CVE-2024-2494 has been classified as a high severity vulnerability due to the potential for application crashes.
How do I fix CVE-2024-2494?
To mitigate CVE-2024-2494, upgrade to the patched versions of libvirt as specified in the vulnerability documentation.
What systems are affected by CVE-2024-2494?
CVE-2024-2494 affects specific versions of libvirt on Ubuntu and Debian systems.
What causes the issue in CVE-2024-2494?
CVE-2024-2494 is caused by improper memory allocation in the RPC server's deserialization code.
Is CVE-2024-2494 easily exploitable?
Exploitation of CVE-2024-2494 is feasible in scenarios where malicious input can be passed to the affected libvirt APIs.
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