Vulnerabilities > CVE-2016-9378 - Improper Access Control vulnerability in XEN
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
PARTIAL Summary
Xen 4.5.x through 4.7.x on AMD systems without the NRip feature, when emulating instructions that generate software interrupts, allows local HVM guest OS users to cause a denial of service (guest crash) by leveraging an incorrect choice for software interrupt delivery.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 11 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Embedding Scripts within Scripts An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
- Signature Spoofing by Key Theft An attacker obtains an authoritative or reputable signer's private signature key by theft and then uses this key to forge signatures from the original signer to mislead a victim into performing actions that benefit the attacker.
Nessus
NASL family SuSE Local Security Checks NASL id OPENSUSE-2017-4.NASL description This updates xen to version 4.5.5 to fix the following issues : - An unprivileged user in a guest could gain guest could escalate privilege to that of the guest kernel, if it had could invoke the instruction emulator. Only 64-bit x86 HVM guest were affected. Linux guest have not been vulnerable. (boo#1016340, CVE-2016-10013) - An unprivileged user in a 64 bit x86 guest could gain information from the host, crash the host or gain privilege of the host (boo#1009107, CVE-2016-9383) - An unprivileged guest process could (unintentionally or maliciously) obtain or ocorrupt sensitive information of other programs in the same guest. Only x86 HVM guests have been affected. The attacker needs to be able to trigger the Xen instruction emulator. (boo#1000106, CVE-2016-7777) - A guest on x86 systems could read small parts of hypervisor stack data (boo#1012651, CVE-2016-9932) - A malicious guest kernel could hang or crash the host system (boo#1014298, CVE-2016-10024) - The epro100 emulated network device caused a memory leak in the host when unplugged in the guest. A privileged user in the guest could use this to cause a DoS on the host or potentially crash the guest process on the host (boo#1013668, CVE-2016-9101) - The ColdFire Fast Ethernet Controller was vulnerable to an infinite loop that could be trigged by a privileged user in the guest, leading to DoS (boo#1013657, CVE-2016-9776) - A malicious guest administrator could escalate their privilege to that of the host. Only affects x86 HVM guests using qemu older version 1.6.0 or using the qemu-xen-traditional. (boo#1011652, CVE-2016-9637) - An unprivileged guest user could escalate privilege to that of the guest administrator on x86 HVM guests, especially on Intel CPUs (boo#1009100, CVE-2016-9386) - An unprivileged guest user could escalate privilege to that of the guest administrator (on AMD CPUs) or crash the system (on Intel CPUs) on 32-bit x86 HVM guests. Only guest operating systems that allowed a new task to start in VM86 mode were affected. (boo#1009103, CVE-2016-9382) - A malicious guest administrator could crash the host on x86 PV guests only (boo#1009104, CVE-2016-9385) - An unprivileged guest user was able to crash the guest. (boo#1009108, CVE-2016-9377, CVE-2016-9378) - A malicious guest administrator could get privilege of the host emulator process on x86 HVM guests. (boo#1009109, CVE-2016-9381) - A vulnerability in pygrub allowed a malicious guest administrator to obtain the contents of sensitive host files, or even delete those files (boo#1009111, CVE-2016-9379, CVE-2016-9380) - A privileged guest user could cause an infinite loop in the RTL8139 ethernet emulation to consume CPU cycles on the host, causing a DoS situation (boo#1007157, CVE-2016-8910) - A privileged guest user could cause an infinite loop in the intel-hda sound emulation to consume CPU cycles on the host, causing a DoS situation (boo#1007160, CVE-2016-8909) - A privileged guest user could cause a crash of the emulator process on the host by exploiting a divide by zero vulnerability of the JAZZ RC4030 chipset emulation (boo#1005004 CVE-2016-8667) - A privileged guest user could cause a crash of the emulator process on the host by exploiting a divide by zero issue of the 16550A UART emulation (boo#1005005, CVE-2016-8669) - A privileged guest user could cause a memory leak in the USB EHCI emulation, causing a DoS situation on the host (boo#1003870, CVE-2016-7995) - A privileged guest user could cause an infinite loop in the USB xHCI emulation, causing a DoS situation on the host (boo#1004016, CVE-2016-8576) - A privileged guest user could cause an infinite loop in the ColdFire Fash Ethernet Controller emulation, causing a DoS situation on the host (boo#1003030, CVE-2016-7908) - A privileged guest user could cause an infinite loop in the AMD PC-Net II emulation, causing a DoS situation on the host (boo#1003032, CVE-2016-7909) - Cause a reload of clvm in the block-dmmd script to avoid a blocking lvchange call (boo#1002496) last seen 2020-06-05 modified 2017-01-03 plugin id 96252 published 2017-01-03 reporter This script is Copyright (C) 2017-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/96252 title openSUSE Security Update : xen (openSUSE-2017-4) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201612-56.NASL description The remote host is affected by the vulnerability described in GLSA-201612-56 (Xen: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Xen. Please review the CVE identifiers referenced below for details. Impact : A local attacker could possibly execute arbitrary code with the privileges of the process, could gain privileges on the host system, cause a Denial of Service condition, or obtain sensitive information. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 96231 published 2017-01-03 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/96231 title GLSA-201612-56 : Xen: Multiple vulnerabilities NASL family Fedora Local Security Checks NASL id FEDORA_2016-68B71978A1.NASL description xen : various security flaws (#1397383) x86 null segments not always treated as unusable [XSA-191, CVE-2016-9386] x86 task switch to VM86 mode mis-handled [XSA-192, CVE-2016-9382] x86 segment base write emulation lacking canonical address checks [XSA-193, CVE-2016-9385] x86 64-bit bit test instruction emulation broken [XSA-195, CVE-2016-9383] x86 software interrupt injection mis-handled [XSA-196, CVE-2016-9377, CVE-2016-9378] qemu incautious about shared ring processing [XSA-197, CVE-2016-9381] delimiter injection vulnerabilities in pygrub [XSA-198, CVE-2016-9379, CVE-2016-9380] Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-12-05 plugin id 95491 published 2016-12-05 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95491 title Fedora 23 : xen (2016-68b71978a1) NASL family Fedora Local Security Checks NASL id FEDORA_2016-95C104A4C6.NASL description xen : various security flaws (#1397383) x86 null segments not always treated as unusable [XSA-191, CVE-2016-9386] x86 task switch to VM86 mode mis-handled [XSA-192, CVE-2016-9382] x86 segment base write emulation lacking canonical address checks [XSA-193, CVE-2016-9385] x86 64-bit bit test instruction emulation broken [XSA-195, CVE-2016-9383] x86 software interrupt injection mis-handled [XSA-196, CVE-2016-9377, CVE-2016-9378] qemu incautious about shared ring processing [XSA-197, CVE-2016-9381] delimiter injection vulnerabilities in pygrub [XSA-198, CVE-2016-9379, CVE-2016-9380] Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-12-05 plugin id 95492 published 2016-12-05 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95492 title Fedora 24 : xen (2016-95c104a4c6) NASL family SuSE Local Security Checks NASL id SUSE_SU-2016-3067-1.NASL description xen was updated to version 4.7.1 to fix 17 security issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652). - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100). - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103). - CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104). - CVE-2016-9384: Guest 32-bit ELF symbol table load leaking host data to unprivileged guest users (bsc#1009105). - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107). - CVE-2016-9377: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108). - CVE-2016-9378: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109). - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111). - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111). - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106). - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157). - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004). - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005). - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030). - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032). The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 95709 published 2016-12-12 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95709 title SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2016:3067-1) NASL family Misc. NASL id XEN_SERVER_XSA-198.NASL description According to its self-reported version number, the Xen hypervisor installed on the remote host is missing a security update. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in the inject_swint() function in x86_emulate.c due to improper handling of the format of IDT lookups when emulating instructions which generate software interrupts. A guest attacker can exploit this to crash the host, resulting in a denial of service condition. (CVE-2016-9377) - A flaw exists in the svm_inject_trap() function in svm.c due to a failure to properly perform IDT privilege checks when emulating instructions which generate software interrupts. A guest attacker can exploit this to crash the host, resulting in a denial of service condition. (CVE-2016-9378) - A flaw exists in the sniff_netware() function in file tools/pygrub/src/pygrub due to improper handling of string quotes and S-expressions in the bootloader when the S-expressions output format is requested. A guest attacker can exploit this to cause the bootloader configuration file to produce incorrect output, resulting in the disclosure or deletion of files from the host. (CVE-2016-9379) - A flaw exists in the sniff_netware() function in file tools/pygrub/src/pygrub due to improper handling of NULL bytes in the bootloader when the null-delimited output format is requested. A guest attacker can exploit this to cause configuration files to output ambiguous or confusing results, resulting in the disclosure or deletion of files from the host. (CVE-2016-9380) - A double-fetch flaw exists that is triggered when the compiler omits QEMU optimizations. A guest attacker can exploit this to gain elevated privileges on the host. (CVE-2016-9381) - A flaw exists in the hvm_task_switch() function in hvm.c due to improper handling of x86 task switching to VM86 mode. A guest attacker can exploit this to cause a denial of service condition or gain elevated privileges within the guest environment. (CVE-2016-9382) - A flaw exists in the x86_emulate() function in x86_emulate.c that allows a guest attacker to cause changes to memory and thereby gain elevated privileges on the host. (CVE-2016-9383) - A flaw exists that is triggered as unused bytes in image metadata are not properly cleared during symbol table loading. This may allow a guest attacker to disclose potentially sensitive information from the host. (CVE-2016-9384) - A flaw exists due to improper clearing of unused bytes in image metadata during symbol table loading. A guest attacker can exploit this to disclose sensitive information from the host. (CVE-2016-9384) - A flaw exists in the x86 segment base write emulation due to a lack of canonical address checks. A guest attacker can exploit this issue to crash the host, resulting in a denial of service condition. (CVE-2016-9385) - A flaw exists in the x86 emulator due to improper validation of the usability of segments when performing memory accesses. A guest attacker can exploit this to gain elevated privileges within the guest environment. (CVE-2016-9386) Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall. last seen 2020-06-01 modified 2020-06-02 plugin id 95630 published 2016-12-08 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95630 title Xen Multiple Vulnerabilities (XSA-191 - XSA-198) NASL family SuSE Local Security Checks NASL id SUSE_SU-2016-3083-1.NASL description This update for xen to version 4.5.5 fixes several issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652) - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100) - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103) - CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104) - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107) - CVE-2016-9378: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108) - CVE-2016-9377: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109) - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111) - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106) - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157) - CVE-2016-8909: The intel_hda_xfer function in hw/audio/intel-hda.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) via an entry with the same value for buffer length and pointer position (bsc#1007160). - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004) - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005) - CVE-2016-7995: A memory leak in ehci_process_itd allowed a privileged user inside guest to DoS the host (bsc#1003870). - CVE-2016-8576: The xhci_ring_fetch function in hw/usb/hcd-xhci.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by leveraging failure to limit the number of link Transfer Request Blocks (TRB) to process (bsc#1004016). - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030) - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 95761 published 2016-12-13 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95761 title SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2016:3083-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2016-1477.NASL description xen was updated to version 4.7.1 to fix 17 security issues. These security issues were fixed : - CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652). - CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100). - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103). - CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104). - CVE-2016-9384: Guest 32-bit ELF symbol table load leaking host data to unprivileged guest users (bsc#1009105). - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107). - CVE-2016-9377: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108). - CVE-2016-9378: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108) - CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109). - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111). - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111). - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106). - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157). - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004). - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005). - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030). - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032). These non-security issues were fixed : - bsc#1004981: Xen RPM didn last seen 2020-06-05 modified 2016-12-16 plugin id 95910 published 2016-12-16 reporter This script is Copyright (C) 2016-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/95910 title openSUSE Security Update : xen (openSUSE-2016-1477) NASL family Fedora Local Security Checks NASL id FEDORA_2016-999E1A6927.NASL description xen : various security flaws (#1397383) x86 null segments not always treated as unusable [XSA-191, CVE-2016-9386] x86 task switch to VM86 mode mis-handled [XSA-192, CVE-2016-9382] x86 segment base write emulation lacking canonical address checks [XSA-193, CVE-2016-9385] guest 32-bit ELF symbol table load leaking host data [XSA-194, CVE-2016-9384] x86 64-bit bit test instruction emulation broken [XSA-195, CVE-2016-9383] x86 software interrupt injection mis-handled [XSA-196, CVE-2016-9377, CVE-2016-9378] qemu incautious about shared ring processing [XSA-197, CVE-2016-9381] delimiter injection vulnerabilities in pygrub [XSA-198, CVE-2016-9379, CVE-2016-9380] Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-12-05 plugin id 95493 published 2016-12-05 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95493 title Fedora 25 : xen (2016-999e1a6927)