{"id":"CVE-2018-16872","aliases":["DEBIAN-CVE-2018-16872","DLA-1694-1","DSA-4454-1","EUVD-2018-8663","GHSA-w3c5-x9c8-47hc","SUSE-SU-2019:0423-1","SUSE-SU-2019:0435-1","SUSE-SU-2019:0471-1","SUSE-SU-2019:0471-2","SUSE-SU-2019:0489-1","SUSE-SU-2019:0582-1","UBUNTU-CVE-2018-16872","USN-3923-1","openSUSE-SU-2019:0254-1","openSUSE-SU-2024:11287-1"],"status":"published","title":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in...","description":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.","severity":{"version":"3.0","score":5,"vector":"CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.01075,"percentile":0.652,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-367"],"published":"2018-12-13T00:00:00Z","modified":"2026-10-24T10:30:22Z","fixes":[{"ecosystem":"Debian:12","package":"qemu","fixed_in":["1:3.1+dfsg-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"qemu","fixed_in":["1:3.1+dfsg-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"qemu","fixed_in":["1:3.1+dfsg-2"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"qemu","fixed_in":["1:2.11+dfsg-1ubuntu7.12"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:3.1+dfsg-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:3.1+dfsg-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:3.1+dfsg-2"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.1+dfsg-12+deb8u10"}]}],"versions":["1:2.1+dfsg-11","1:2.1+dfsg-12","1:2.1+dfsg-12+deb8u1","1:2.1+dfsg-12+deb8u2","1:2.1+dfsg-12+deb8u3","1:2.1+dfsg-12+deb8u4","1:2.1+dfsg-12+deb8u4~bpo70+1","1:2.1+dfsg-12+deb8u5","1:2.1+dfsg-12+deb8u5a","1:2.1+dfsg-12+deb8u5a~bpo70+1","1:2.1+dfsg-12+deb8u6","1:2.1+dfsg-12+deb8u7","1:2.1+dfsg-12+deb8u8","1:2.1+dfsg-12+deb8u9","1:2.1+dfsg-12~bpo70+1"],"bundled":3},{"source":"osv","ecosystem":"Debian:9","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.8+dfsg-6+deb9u6"}]}],"versions":["1:2.8+dfsg-6","1:2.8+dfsg-6+deb9u1","1:2.8+dfsg-6+deb9u2","1:2.8+dfsg-6+deb9u3","1:2.8+dfsg-6+deb9u4","1:2.8+dfsg-6+deb9u5"],"bundled":12},{"source":"osv","ecosystem":"SUSE:Linux 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hat","product":"qemu:"}],"references":[{"url":"https://lists.debian.org/debian-lts-announce/2019/02/msg00041.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://www.securityfocus.com/bid/106212","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","Third Party Advisory","advisory"]},{"url":"https://usn.ubuntu.com/3923-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJMTVGDLA654HNCDGLCUEIP36SNJEKK7/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","Third Party 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flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.","status":"published","published":"2018-12-13T21:00:00Z","modified":"2024-08-05T10:32:54.018Z","cvss":[{"version":"3.0","score":5,"vector":"CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:35:11.072321Z"}],"euvd":[{"id":"EUVD-2018-8663","description":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.","status":"published","published":"2018-12-13T21:00:00Z","modified":"2024-08-05T10:32:54Z","cvss":[{"version":"3.0","score":5,"vector":"CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T02:39:40.316949Z"}],"ghsa":[{"id":"GHSA-w3c5-x9c8-47hc","title":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in...","description":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.","status":"published","published":"2022-05-13T01:12:25Z","modified":"2023-02-13T00:31:00Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:54:05.462623Z"}],"nvd":[{"id":"CVE-2018-16872","description":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.","status":"published","published":"2018-12-13T21:29:00.26Z","modified":"2026-06-17T01:44:57.62Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"3.0","score":5,"vector":"CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:P/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:04:50.99633Z"}],"osv":[{"id":"CVE-2018-16872","description":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.","status":"published","published":"2018-12-13T21:29:00.26Z","modified":"2026-10-24T10:30:22.389426546Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:08.533609Z"},{"id":"DEBIAN-CVE-2018-16872","description":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.","status":"published","published":"2018-12-13T21:29:00.26Z","modified":"2026-10-23T18:03:19.788796153Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:30.290351Z"},{"id":"UBUNTU-CVE-2018-16872","description":"A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.","status":"published","published":"2018-12-13T00:00:00Z","modified":"2026-02-04T02:24:39.425467Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"},{"version":"3.0","score":5,"vector":"CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L","level":"medium"},{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:17.496046Z"},{"id":"DLA-1694-1","title":"qemu - security update","status":"published","published":"2019-02-28T00:00:00Z","modified":"2026-03-09T01:23:03.630637Z","updated_at":"2026-11-02T15:46:09.777694Z"},{"id":"DSA-4454-1","title":"qemu - security update","status":"published","published":"2019-05-30T00:00:00Z","modified":"2026-03-09T02:10:53.225814Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"id":"openSUSE-SU-2019:0254-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-6778: Fixed a heap buffer overflow issue in the SLiRP networking implementation (bsc#1123156).\n- CVE-2018-16872: Fixed a host security vulnerability related to handling symlinks in usb-mtp (bsc#1119493).\n- CVE-2018-19489: Fixed a denial of service vulnerability in virtfs (bsc#1117275).\n- CVE-2018-19364: Fixed a use-after-free if the virtfs interface resulting in a denial of service (bsc#1116717).\n- CVE-2018-18954: Fixed a denial of service vulnerability related to PowerPC PowerNV memory operations (bsc#1114957).\n\nNon-security issues fixed:\n\n- Improved disk performance for qemu on xen (bsc#1100408).\n- Fixed xen offline migration (bsc#1079730, bsc#1101982, bsc#1063993).\n- Fixed pwrite64/pread64/write to return 0 over -1 for a zero length NULL buffer in qemu (bsc#1121600).\n- Use /bin/bash to echo value into sys fs for ksm control (bsc#1112646).\n- Return specification exception for unimplemented diag 308 subcodes rather than a hardware error (bsc#1123179).\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2019-03-23T11:07:37Z","modified":"2026-02-04T03:39:38.502397Z","updated_at":"2026-11-02T16:58:30.39372Z"},{"id":"openSUSE-SU-2024:11287-1","title":"qemu-6.1.0-32.1 on GA media","description":"These are all security issues fixed in the qemu-6.1.0-32.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2025-05-07T18:08:57.481645Z","updated_at":"2026-11-02T16:58:34.894275Z"},{"id":"SUSE-SU-2019:0423-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-6778: Fixed a heap buffer overflow issue in the SLiRP networking implementation (bsc#1123156).\n- CVE-2018-16872: Fixed a host security vulnerability related to handling symlinks in usb-mtp (bsc#1119493).\n- CVE-2018-19489: Fixed a denial of service vulnerability in virtfs (bsc#1117275).\n- CVE-2018-19364: Fixed a use-after-free if the virtfs interface resulting in a denial of service (bsc#1116717).\n- CVE-2018-18954: Fixed a denial of service vulnerability related to PowerPC PowerNV memory operations (bsc#1114957).\n\nNon-security issues fixed:\n\n- Improved disk performance for qemu on xen (bsc#1100408).\n- Fixed xen offline migration (bsc#1079730, bsc#1101982, bsc#1063993).\n- Fixed pwrite64/pread64/write to return 0 over -1 for a zero length NULL buffer in qemu (bsc#1121600).\n- Use /bin/bash to echo value into sys fs for ksm control (bsc#1112646).\n- Return specification exception for unimplemented diag 308 subcodes rather than a hardware error (bsc#1123179).\n","status":"published","published":"2019-02-18T15:26:50Z","modified":"2026-02-04T04:22:58.164555Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"SUSE-SU-2019:0435-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-6778: Fixed a heap buffer overflow issue in the SLiRP networking implementation (bsc#1123156).\n- CVE-2018-16872: Fixed a host security vulnerability related to handling symlinks in usb-mtp (bsc#1119493).\n- CVE-2018-19489: Fixed a denial of service vulnerability in virtfs (bsc#1117275).\n- CVE-2018-19364: Fixed a use-after-free if the virtfs interface resulting in a denial of service (bsc#1116717).\n- CVE-2018-18954: Fixed a denial of service vulnerability related to PowerPC PowerNV memory operations (bsc#1114957).\n\nNon-security issues fixed:\n\n- Improved disk performance for qemu on xen (bsc#1100408).\n- Fixed xen offline migration (bsc#1079730, bsc#1101982, bsc#1063993).\n- Fixed pwrite64/pread64/write to return 0 over -1 for a zero length NULL buffer in qemu (bsc#1121600).\n- Use /bin/bash to echo value into sys fs for ksm control (bsc#1112646).\n- Return specification exception for unimplemented diag 308 subcodes rather than a hardware error (bsc#1123179).\n","status":"published","published":"2019-02-19T12:12:38Z","modified":"2026-02-04T02:22:49.786112Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"SUSE-SU-2019:0471-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2019-6778: Fixed a heap buffer overflow issue in the SLiRP networking implementation (bsc#1123156).\n- CVE-2018-16872: Fixed a host security vulnerability related to handling symlinks in usb-mtp (bsc#1119493).\n- CVE-2018-19489: Fixed a denial of service vulnerability in virtfs (bsc#1117275).\n- CVE-2018-19364: Fixed a use-after-free if the virtfs interface resulting in a denial of service (bsc#1116717).\n","status":"published","published":"2019-02-22T12:47:28Z","modified":"2026-02-04T04:36:52.806007Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"SUSE-SU-2019:0471-2","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2019-6778: Fixed a heap buffer overflow issue in the SLiRP networking implementation (bsc#1123156).\n- CVE-2018-16872: Fixed a host security vulnerability related to handling symlinks in usb-mtp (bsc#1119493).\n- CVE-2018-19489: Fixed a denial of service vulnerability in virtfs (bsc#1117275).\n- CVE-2018-19364: Fixed a use-after-free if the virtfs interface resulting in a denial of service (bsc#1116717).\n","status":"published","published":"2019-04-27T15:57:03Z","modified":"2026-02-04T04:13:34.437584Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"SUSE-SU-2019:0489-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-6778: Fixed a heap buffer overflow issue in the SLiRP networking implementation (bsc#1123156).\n- CVE-2018-16872: Fixed a host security vulnerability related to handling symlinks in usb-mtp (bsc#1119493).\n- CVE-2018-19489: Fixed a denial of service vulnerability in virtfs (bsc#1117275).\n- CVE-2018-19364: Fixed a use-after-free if the virtfs interface resulting in a denial of service (bsc#1116717).\n- CVE-2018-7858: Fixed a denial of service which could occur while updating the VGA display, after guest has adjusted the display dimensions (bsc#1084604).\n- CVE-2017-13673: Fixed a denial of service in the cpu_physical_memory_snapshot_get_dirty function.\n- CVE-2017-13672: Fixed a denial of service via vectors involving display update.\n\nNon-security issues fixed:\n\n- Fixed bad guest time after migration (bsc#1113231).\n","status":"published","published":"2019-02-26T07:40:31Z","modified":"2026-02-04T03:59:44.996909Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"SUSE-SU-2019:0582-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity vulnerabilities addressed:\n\n- CVE-2019-6778: Fixed an out-of-bounds access in slirp (bsc#1123156)\n- CVE-2018-16872: Fixed a host security vulnerability related to handling symlinks in usb-mtp (bsc#1119493)\n- CVE-2018-19489: Fixed a Denial-of-Service in virtfs (bsc#1117275)\n- CVE-2018-19364: Fixed an use-after-free vulnerability if virtfs interface is deliberately abused (bsc#1116717)\n- CVE-2018-18954: Fixed an out-of-bounds access performing PowerNV memory operations (bsc#1114957)\n- CVE-2017-13673: Fixed a reachable assert failure during during display update (bsc#1056386)\n- CVE-2017-13672: Fixed an out-of-bounds read access during display update (bsc#1056334)\n- CVE-2018-7858: Fixed an out-of-bounds access in cirrus when updating vga display allowing for Denial-of-Service (bsc#1084604)\n\nOther bug fixes and changes:\n\n- Fix pwrite64/pread64/write to return 0 over -1 for a zero length NULL buffer in qemu (bsc#1121600)\n- Fix bad guest time after migration (bsc#1113231)\n","status":"published","published":"2019-03-11T17:34:20Z","modified":"2025-05-02T04:06:23.528007Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"USN-3923-1","title":"qemu vulnerabilities","description":"Michael Hanselmann discovered that QEMU incorrectly handled the Media\nTransfer Protocol (MTP). An attacker inside the guest could use this issue\nto read or write arbitrary files and cause a denial of service, or possibly\nexecute arbitrary code. This issue only affected Ubuntu 18.10.\n(CVE-2018-16867)\n\nMichael Hanselmann discovered that QEMU incorrectly handled the Media\nTransfer Protocol (MTP). An attacker inside the guest could use this issue\nto read arbitrary files, contrary to expectations. This issue only affected\nUbuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-16872)\n\nZhibin Hu discovered that QEMU incorrectly handled the Plan 9 File System\nsupport. An attacker inside the guest could use this issue to cause QEMU to\ncrash, resulting in a denial of service. (CVE-2018-19489)\n\nLi Quang and Saar Amar discovered multiple issues in the QEMU PVRDMA\ndevice. An attacker inside the guest could use these issues to cause a\ndenial of service, or possibly execute arbitrary code. This issue only\naffected Ubuntu 18.10. These issues were resolved by disabling PVRDMA\nsupport in Ubuntu 18.10. (CVE-2018-20123, CVE-2018-20124, CVE-2018-20125,\nCVE-2018-20126, CVE-2018-20191, CVE-2018-20216)\n\nMichael Hanselmann discovered that QEMU incorrectly handled certain i2c\ncommands. A local attacker could possibly use this issue to read QEMU\nprocess memory. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10.\n(CVE-2019-3812)\n\nIt was discovered that QEMU incorrectly handled the Slirp networking\nback-end. An attacker inside the guest could use this issue to cause QEMU\nto crash, resulting in a denial of service, or possibly execute arbitrary\ncode on the host. In the default installation, when QEMU is used with\nlibvirt, attackers would be isolated by the libvirt AppArmor profile.\n(CVE-2019-6778)\n","status":"published","published":"2019-03-27T12:10:22Z","modified":"2026-02-10T04:41:29Z","updated_at":"2026-11-02T16:58:14.019824Z"}]}}