------------------------------------------------------------------------- Debian LTS Advisory DLA-2753-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Markus Koschany September 02, 2021 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : qemu Version : 1:2.8+dfsg-6+deb9u15 CVE ID : CVE-2021-3527 CVE-2021-3592 CVE-2021-3594 CVE-2021-3595 CVE-2021-3682 CVE-2021-3713 Debian Bug : 988157 989993 989995 989996 991911 992727 Several security vulnerabilities have been found in Qemu, a fast processor emulator. CVE-2021-3713 An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU. The device uses the guest supplied stream number unchecked, which can lead to out-of-bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the host. CVE-2021-3682 A flaw was found in the USB redirector device emulation of QEMU. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host. CVE-2021-3527 A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service. CVE-2021-3594 An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. CVE-2021-3592 An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootp_input() function and could occur while processing a udp packet that is smaller than the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality. CVE-2021-3595 An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the tftp_input() function and could occur while processing a udp packet that is smaller than the size of the 'tftp_t' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. For Debian 9 stretch, these problems have been fixed in version 1:2.8+dfsg-6+deb9u15. We recommend that you upgrade your qemu packages. For the detailed security status of qemu please refer to its security tracker page at: https://security-tracker.debian.org/tracker/qemu Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS
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