CVE-2021-3947: Buffer Overflow
First published: Wed Nov 10 2021(Updated: )
A stack buffer overflow flaw was found in NVME in QEMU. The flaw lies in hw/nvme/ctrl.c:nvme_changed_nslist() where a variable named off (Log Page offset) is controlled by guest which if set to bigger than 4096 could lead to an integer underflow. Another variable buf_len can also be partially controlled by the guest which would lead to a stack buffer overflow. Since this flaw allows an attacker to read out of bounds memory it could lead to disclosure of sensitive information.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU qemu | <=6.1.0 | |
| QEMU qemu | =6.2.0-rc0 | |
| QEMU qemu | =6.2.0-rc1 | |
| QEMU qemu | >=6.0.0<=6.1.0 | |
| redhat/qemu-kvm | <6.2.0 | 6.2.0 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2021869
- https://security.gentoo.org/glsa/202208-27
- https://security.netapp.com/advisory/ntap-20220318-0003/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2022084
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2022085
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2021869#c0
- https://lore.kernel.org/qemu-devel/20211111153125.2258176-1-philmd@redhat.com/
- https://lore.kernel.org/qemu-devel/20211117132335.41850-1-its@irrelevant.dk/
- https://gitlab.com/qemu-project/qemu/-/commit/e2c57529c9306e4
Frequently Asked Questions
What is the severity of CVE-2021-3947?
The severity of CVE-2021-3947 is medium with a score of 5.5.
What software is affected by CVE-2021-3947?
QEMU versions up to and including 6.1.0, 6.2.0-rc0, and 6.2.0-rc1 are affected by CVE-2021-3947.
How can a malicious user exploit CVE-2021-3947?
A malicious guest controlling certain input can trigger a stack-buffer-overflow vulnerability in the QEMU NVME component, leading to disclosure of sensitive information.
What is the Common Weakness Enumeration (CWE) ID for CVE-2021-3947?
The CWE ID for CVE-2021-3947 is CWE-125: Out-of-bounds Read.
How can I fix CVE-2021-3947?
Update QEMU to a version that includes the fix for CVE-2021-3947 as provided by the vendor or official software repository.
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