CVE-2020-25084 - Use After Free

Severity

32%

Complexity

15%

Confidentiality

23%

QEMU 5.0.0 has a use-after-free in hw/usb/hcd-xhci.c because the usb_packet_map return value is not checked.

CVSS 3.1 Base Score 3.2. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L).

CVSS 2.0 Base Score 2.1. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:N/I:N/A:P).

Demo Examples

Use After Free

CWE-416

The following example demonstrates the weakness.


               
}
free(buf3R2);

Use After Free

CWE-416

The following code illustrates a use after free error:


               
}
free(ptr);
logError("operation aborted before commit", ptr);

When an error occurs, the pointer is immediately freed. However, this pointer is later incorrectly used in the logError function.

Overview

First reported 4 years ago

2020-09-25 05:15:00

Last updated 4 years ago

2020-10-09 12:15:00

Affected Software

QEMU 5.0.0

5.0.0

References

http://www.openwall.com/lists/oss-security/2020/09/16/5

https://lists.nongnu.org/archive/html/qemu-devel/2020-08/msg08050.html

http://www.openwall.com/lists/oss-security/2020/09/16/5

Mailing List, Patch, Third Party Advisory

https://lists.nongnu.org/archive/html/qemu-devel/2020-08/msg08050.html

Mailing List, Patch, Third Party Advisory

https://security.netapp.com/advisory/ntap-20201009-0005/

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