REDHAT-BUG-1951118: Buffer Overflow
First published: Mon Apr 19 2021(Updated: )
A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario, or potential information leakage from the host memory.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU | <=6.0.0 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1951175
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1960575
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1951118#c10
- https://gitlab.com/qemu-project/qemu/-/issues/338
- https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg07779.html
- https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1951118#c11
- https://gitlab.com/qemu-project/qemu/-/commit/defac5e2fbddf8423a354ff0454283a2115e1367
- https://gitlab.com/qemu-project/qemu/-/commit/46609b90d9e3a6304def11038a76b58ff43f77bc
- https://access.redhat.com/errata/RHSA-2022:7472
- https://access.redhat.com/errata/RHSA-2022:7967
- https://access.redhat.com/security/cve/cve-2021-3507
- https://bugzilla.redhat.com/show_bug.cgi?id=1951118
Frequently Asked Questions
What is the severity of REDHAT-BUG-1951118?
The severity of REDHAT-BUG-1951118 is critical due to the potential for a privileged guest user to exploit the heap buffer overflow.
How do I fix REDHAT-BUG-1951118?
To fix REDHAT-BUG-1951118, update QEMU to a version higher than 6.0.0.
Who is affected by REDHAT-BUG-1951118?
Users running QEMU versions up to and including 6.0.0 are affected by REDHAT-BUG-1951118.
What type of vulnerability is REDHAT-BUG-1951118?
REDHAT-BUG-1951118 is classified as a heap buffer overflow vulnerability.
Can REDHAT-BUG-1951118 be exploited remotely?
No, REDHAT-BUG-1951118 requires a local privileged guest user to exploit the vulnerability.
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