REDHAT-BUG-2254580: Buffer Overflow
First published: Thu Dec 14 2023(Updated: )
A stack based buffer overflow was found in the virtio-net device of QEMU. The flaw occurs while copying data to mhdr, a local variable of type virtio_net_hdr_mrg_rxbuf, when flushing TX in the virtio_net_flush_tx function. If guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1 and VIRTIO_NET_F_MRG_RXBUF are enabled, `n->guest_hdr_len` is set to sizeof(struct virtio_net_hdr_v1_hash), which is bigger than sizeof(virtio_net_hdr_mrg_rxbuf). This vulnerability could potentially allow a malicious user to overwrite local variables adjacent to mhdr allocated on the stack. Specifically, the out_sg variable could be used to read some part of process memory and send it to the wire: ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), out_sg, out_num, virtio_net_tx_complete);
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2256436
- https://lists.nongnu.org/archive/html/qemu-devel/2024-01/msg00045.html
- https://gitlab.com/qemu-project/qemu/-/commit/2220e8189fb94068dbad333228659fbac819abb0
- https://access.redhat.com/errata/RHSA-2024:2962
- https://bugzilla.redhat.com/show_bug.cgi?id=2254580
Frequently Asked Questions
What is the severity of REDHAT-BUG-2254580?
The severity of REDHAT-BUG-2254580 is considered critical due to the potential for remote code execution through stack-based buffer overflow.
How do I fix REDHAT-BUG-2254580?
To fix REDHAT-BUG-2254580, update the QEMU package to the latest version that has addressed this vulnerability.
What systems are affected by REDHAT-BUG-2254580?
The systems affected by REDHAT-BUG-2254580 include any installations of QEMU that utilize the virtio-net device with specific guest features enabled.
What causes the vulnerability in REDHAT-BUG-2254580?
The vulnerability in REDHAT-BUG-2254580 is caused by a stack-based buffer overflow occurring in the virtio_net_flush_tx function when handling certain guest features.
Is there a workaround for REDHAT-BUG-2254580 until I can apply a fix?
Yes, a possible workaround for REDHAT-BUG-2254580 is to disable the affected features on the virtio-net device if feasible.
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