Vulnerabilities > CVE-2018-12892 - Information Exposure vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
SINGLE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
An issue was discovered in Xen 4.7 through 4.10.x. libxl fails to pass the readonly flag to qemu when setting up a SCSI disk, due to what was probably an erroneous merge conflict resolution. Malicious guest administrators or (in some situations) users may be able to write to supposedly read-only disk images. Only emulated SCSI disks (specified as "sd" in the libxl disk configuration, or an equivalent) are affected. IDE disks ("hd") are not affected (because attempts to make them readonly are rejected). Additionally, CDROM devices (that is, devices specified to be presented to the guest as CDROMs, regardless of the nature of the backing storage on the host) are not affected; they are always read only. Only systems using qemu-xen (rather than qemu-xen-traditional) as the device model version are vulnerable. Only systems using libxl or libxl-based toolstacks are vulnerable. (This includes xl, and libvirt with the libxl driver.) The vulnerability is present in Xen versions 4.7 and later. (In earlier versions, provided that the patch for XSA-142 has been applied, attempts to create read only disks are rejected.) If the host and guest together usually support PVHVM, the issue is exploitable only if the malicious guest administrator has control of the guest kernel or guest kernel command line.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 1 | |
| OS | 76 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Subverting Environment Variable Values The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
- Footprinting An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
- Exploiting Trust in Client (aka Make the Client Invisible) An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
- Browser Fingerprinting An attacker carefully crafts small snippets of Java Script to efficiently detect the type of browser the potential victim is using. Many web-based attacks need prior knowledge of the web browser including the version of browser to ensure successful exploitation of a vulnerability. Having this knowledge allows an attacker to target the victim with attacks that specifically exploit known or zero day weaknesses in the type and version of the browser used by the victim. Automating this process via Java Script as a part of the same delivery system used to exploit the browser is considered more efficient as the attacker can supply a browser fingerprinting method and integrate it with exploit code, all contained in Java Script and in response to the same web page request by the browser.
- Session Credential Falsification through Prediction This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.
Nessus
NASL family Misc. NASL id XEN_SERVER_XSA-266.NASL description According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a local security bypass vulnerability. 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 111381 published 2018-07-27 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/111381 title Xen Project Local Security Bypass Vulnerability (XSA-266) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(111381); script_version("1.5"); script_cvs_date("Date: 2019/11/04"); script_cve_id("CVE-2018-12892"); script_bugtraq_id(104571); script_xref(name:"IAVB", value:"2018-B-0094"); script_name(english:"Xen Project Local Security Bypass Vulnerability (XSA-266)"); script_summary(english:"Checks 'xl info' output for the Xen hypervisor version."); script_set_attribute(attribute:"synopsis", value: "The remote Xen hypervisor installation is missing a security update."); script_set_attribute(attribute:"description", value: "According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a local security bypass vulnerability. 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."); script_set_attribute(attribute:"see_also", value:"http://xenbits.xen.org/xsa/advisory-266.html"); script_set_attribute(attribute:"see_also", value:"https://xenbits.xen.org/gitweb/?p=xen.git;a=summary"); script_set_attribute(attribute:"solution", value: "Apply the appropriate patch according to the vendor advisory."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-12892"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2018/06/27"); script_set_attribute(attribute:"patch_publication_date", value:"2018/06/27"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/07/27"); script_set_attribute(attribute:"potential_vulnerability", value:"true"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/o:xen:xen"); script_set_attribute(attribute:"stig_severity", value:"I"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Misc."); script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("xen_server_detect.nbin"); script_require_keys("installed_sw/Xen Hypervisor", "Settings/ParanoidReport"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("install_func.inc"); include("misc_func.inc"); app_name = "Xen Hypervisor"; install = get_single_install(app_name:app_name); if (report_paranoia < 2) audit(AUDIT_PARANOID); version = install['version']; display_version = install['display_version']; path = install['path']; managed_status = install['Managed status']; changeset = install['Changeset']; if (!empty_or_null(changeset)) display_version += " (changeset " + changeset + ")"; # Installations that are vendor-managed are handled by OS-specific local package checks if (managed_status == "managed") audit(AUDIT_INST_PATH_NOT_VULN, app_name, display_version, path); fixes['4.7']['fixed_ver'] = '4.7.5'; fixes['4.7']['fixed_ver_display'] = '4.7.5 (changeset b292518)'; fixes['4.7']['affected_ver_regex'] = '^4\\.7\\.'; fixes['4.7']['affected_changesets'] = make_list("790847d", "f9898e7", "253c3ec", "839826b", "55674ed", "0feed48", "a8d37ee", "117ef5e", "536d16c", "196932a", "0d44ee0", "f9b8c11", "ed4f56d", "3f5bd56", "03bf349", "375c01e", "acdf07d", "53c6a02", "466ab42", "870d737", "fb665b3", "6678f08", "bd63f04", "340c686", "55c1e84", "88f810a", "ea94f1e", "9299683", "8c699a0", "0b5b62a", "ff11aaf", "f666dab", "366e041", "5d271d5", "5d8c6fd", "226c231", "6de86cf", "ce22cc3", "4f713cf", "0b6c7b4", "2bc2e1f", "11fd624", "3478fb7", "0bc0693", "be0d7af", "d355f02", "236b8be", "e9281ad", "fb70754", "a6a2b5a", "54ff338", "1bd5a36", "5fc0102", "a8ef075", "e613050", "2fbc006", "1619cff", "5c81317", "912aa9b", "63b140f", "62b1879", "9680710", "dca80ab"); fixes['4.8']['fixed_ver'] = '4.8.4'; fixes['4.8']['fixed_ver_display'] = '4.8.4-pre (changeset 321254a)'; fixes['4.8']['affected_ver_regex'] = '^4\\.8\\.'; fixes['4.8']['affected_changesets'] = make_list("500d567", "5fd28d2", "d615412", "9a7fa68", "b736afd", "b9b9d9e", "028656f", "c1aaad5", "c5a5692", "1522a81", "37b3dfd", "f8a489f", "0954b11", "266d511", "2d97baa", "61fc6a4", "73b68d2", "811c168", "eef72b8", "ae0a87e", "b494c13", "c36aaca", "1afb894", "845d2b6", "9d73586", "7f4ae16", "05b41f2", "618a96e", "455a429", "1fd1973", "ef14d39", "c696ef0", "68d02a7", "b0ea18e", "e60a287", "9419337", "cc0bb3b", "197e605", "eaa9d0a", "d66898a", "f2837b5", "0f475fe", "210bd51", "b4ad8a6", "4cdd4cc", "193130f", "7f2959f", "9cba9ae", "f99bc15", "44c709e", "c10ddc1", "2bef7bf", "326d25f", "3f59d0b", "a89390b", "40c4ab8", "90676b7", "1052a21", "a2f02df", "501718a", "957ff30", "1e9ac23", "95befc6", "372583c", "202aaf8", "e4e9632", "a753be1", "8f9846f", "0864795", "866deda", "c67e19f", "bc6414f", "883c8db", "7db1c43", "813fe21", "3cadc8b", "f7bf4d2", "14217cb", "ce185fb", "a2700ca", "b19b206", "a442d40", "1901f62", "1581910", "15f57b8", "7ef31c0", "bc8aa42", "30a153d", "da92664", "6b08396", "f6ae9c0", "ad9ddc3", "22d2146", "f9adc12", "e27fd5c", "03f9474", "c31070f", "1093876", "141be84", "bb49733", "48faa50", "5938aa1", "d11783c", "8e1e3c7", "99ed786", "76bdfe8", "fee4689", "c0bfde6", "64c1742", "8615385", "e09a5c2", "ff570a3", "e6bcb41", "29e7171", "c3d195c", "2cd189e", "afdad6a", "532ccf4", "da49e51", "ca9583d", "479b879", "2eefd92", "60c50f2", "1838e21", "5732a8e", "987b08d", "eadcd83", "ef2464c", "17bfbc8", "499391b", "87cb0e2", "393de92"); fixes['4.9']['fixed_ver'] = '4.9.3'; fixes['4.9']['fixed_ver_display'] = '4.9.3-pre (changeset 5d92007)'; fixes['4.9']['affected_ver_regex'] = '^4\\.9\\.'; fixes['4.9']['affected_changesets'] = make_list("c257e35", "ad08a1b", "c50b1f6", "238007d", "0b1904c", "859fc55", "1c6b8f2", "f51d368", "8689cd1", "fc72347", "27b0dcd", "8d874a8", "1284b90", "12259ff", "516ac8a", "ed217c9", "11eb72e", "3f85ebb", "1ed3466", "37c3cb4", "2aca1d7", "22a6433", "8a29d83", "14a2ad6", "c6d09b2", "e5de993", "c2029b4", "5633efa", "13cb0c2", "da140c6", "39ab89d", "a29695c", "74fa955", "b3277ca", "cf264eb", "809d543", "002ea4d", "1f183b5", "150cdd9", "f7889b3", "903f2f6", "4bbed1c", "2303a9d", "d674b6e", "52fa2f7", "62bd851", "c06ec81", "dbb06d3", "24fa3fa", "b9b5a03", "35a71c6", "b844573", "48dd543", "7866e11", "db7accf", "921bff4", "c147505", "dc527ff", "781e23a", "72ca580", "47d41f6", "7a59015", "259bee9", "6d4c4f0", "3e010f5"); fixes['4.10']['fixed_ver'] = '4.10.2'; fixes['4.10']['fixed_ver_display'] = '4.10.2-pre (changeset 2308158)'; fixes['4.10']['affected_ver_regex'] = '^4\\.10\\.'; fixes['4.10']['affected_changesets'] = make_list("b2444d2", "42219af", "1d5a9ec", "eeb1576", "4b9dc6d", "52447b3", "7b35e78", "8d48204", "b3a7f2f", "fb78102", "245eaee", "18833a8", "72e5b16", "27a4161", "23114db", "6300cdd", "2a0913e", "daaf3dd", "c2b84e7", "908ddbb", "c75bbf1", "e9dc0a6", "470daef", "c9fdfbb", "49aebf4", "48ad1ab", "98a285c", "cb2a83f", "51b7b5d", "840d683", "ec50d21", "a035518", "8342e3f", "aaf66de", "7e21b75", "f155f55", "3a903b3", "2e2f337", "850e5ad", "13fa2a4", "ade8f98", "a7f8880", "3bb756b", "1aa6305", "d93ae63", "6b8d820", "f253feb"); fix = NULL; foreach ver_branch (keys(fixes)) { if (version =~ fixes[ver_branch]['affected_ver_regex']) { ret = ver_compare(ver:version, fix:fixes[ver_branch]['fixed_ver']); if (ret < 0) fix = fixes[ver_branch]['fixed_ver_display']; else if (ret == 0) { if (empty_or_null(changeset)) fix = fixes[ver_branch]['fixed_ver_display']; else foreach affected_changeset (fixes[ver_branch]['affected_changesets']) if (changeset == affected_changeset) fix = fixes[ver_branch]['fixed_ver_display']; } } } if (empty_or_null(fix)) audit(AUDIT_INST_PATH_NOT_VULN, app_name, display_version, path); items = make_array( "Installed version", display_version, "Fixed version", fix, "Path", path ); order = make_list("Path", "Installed version", "Fixed version"); report = report_items_str(report_items:items, ordered_fields:order) + '\n'; security_report_v4(port:0, extra:report, severity:SECURITY_WARNING);NASL family SuSE Local Security Checks NASL id OPENSUSE-2018-803.NASL description This update for xen fixes the following issues : Security issues fixed : - CVE-2018-3665: Fix Lazy FP Save/Restore issue (XSA-267) (bsc#1095242). - CVE-2018-12891: Fix possible Denial of Service (DoS) via certain PV MMU operations that affect the entire host (XSA-264) (bsc#1097521). - CVE-2018-12892: Fix libxl to honour the readonly flag on HVM emulated SCSI disks (XSA-266) (bsc#1097523). - CVE-2018-12893: Fix crash/Denial of Service (DoS) via safety check (XSA-265) (bsc#1097522). - CVE-2018-11806: Fix heap buffer overflow while reassembling fragmented datagrams (bsc#1096224). Bug fixes : - bsc#1027519: Add upstream patches from January. - bsc#1087289: Fix xen scheduler crash. This update was imported from the SUSE:SLE-12-SP3:Update update project. last seen 2020-06-05 modified 2018-08-07 plugin id 111565 published 2018-08-07 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/111565 title openSUSE Security Update : xen (openSUSE-2018-803) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-2059-1.NASL description This update for xen fixes the following issues: Security issues fixed : - CVE-2018-3665: Fix Lazy FP Save/Restore issue (XSA-267) (bsc#1095242). - CVE-2018-12891: Fix possible Denial of Service (DoS) via certain PV MMU operations that affect the entire host (XSA-264) (bsc#1097521). - CVE-2018-12892: Fix libxl to honour the readonly flag on HVM emulated SCSI disks (XSA-266) (bsc#1097523). - CVE-2018-12893: Fix crash/Denial of Service (DoS) via safety check (XSA-265) (bsc#1097522). - CVE-2018-11806: Fix heap buffer overflow while reassembling fragmented datagrams (bsc#1096224). Bug fixes : - bsc#1027519: Add upstream patches from January. - bsc#1087289: Fix xen scheduler crash. 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 111348 published 2018-07-26 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/111348 title SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2018:2059-1) NASL family Fedora Local Security Checks NASL id FEDORA_2018-1A467757CE.NASL description preemption checks bypassed in x86 PV MM handling [XSA-264, CVE-2018-12891] x86: #DB exception safety check can be triggered by a guest [XSA-265, CVE-2018-12893] libxl fails to honour readonly flag on HVM emulated SCSI disks [XSA-266, CVE-2018-12892] ---- Speculative register leakage from lazy FPU context switching [XSA-267, CVE-2018-3665] fix for change in iasl output 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 2018-07-24 plugin id 111236 published 2018-07-24 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/111236 title Fedora 27 : xen (2018-1a467757ce) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-2081-1.NASL description This update for xen fixes the following issues: Security issues fixed : - CVE-2018-12891: Fix preemption checks bypass in x86 PV MM handling (XSA-264) (bsc#1097521). - CVE-2018-12892: Fix libxl failure to honour readonly flag on HVM emulated SCSI disks (XSA-266) (bsc#1097523). - CVE-2018-12893: Fix #DB exception safety check that could be triggered by a guest (XSA-265) (bsc#1097522). - CVE-2018-11806: Fix heap buffer overflow while reassembling fragmented datagrams (bsc#1096224). - CVE-2018-3665: Fix lazy FP Save/Restore (XSA-267) (bsc#1095242). Bug fixes : - bsc#1027519: Update to Xen 4.7.6 bug fix only release. - bsc#1087289: Xen BUG at sched_credit.c:1663. - bsc#1094725: `virsh blockresize` does not work with Xen qdisks. 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 111433 published 2018-07-30 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/111433 title SUSE SLES12 Security Update : xen (SUSE-SU-2018:2081-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-2081-2.NASL description This update for xen fixes the following issues : Security issues fixed : CVE-2018-12891: Fix preemption checks bypass in x86 PV MM handling (XSA-264) (bsc#1097521). CVE-2018-12892: Fix libxl failure to honour readonly flag on HVM emulated SCSI disks (XSA-266) (bsc#1097523). CVE-2018-12893: Fix #DB exception safety check that could be triggered by a guest (XSA-265) (bsc#1097522). CVE-2018-11806: Fix heap buffer overflow while reassembling fragmented datagrams (bsc#1096224). CVE-2018-3665: Fix lazy FP Save/Restore (XSA-267) (bsc#1095242). Bug fixes: bsc#1027519: Update to Xen 4.7.6 bug fix only release. bsc#1087289: Xen BUG at sched_credit.c:1663. bsc#1094725: `virsh blockresize` does not work with Xen qdisks. 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 118277 published 2018-10-22 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118277 title SUSE SLES12 Security Update : xen (SUSE-SU-2018:2081-2) NASL family SuSE Local Security Checks NASL id OPENSUSE-2019-533.NASL description This update for xen fixes the following issues : Security issues fixed : - CVE-2018-3665: Fix Lazy FP Save/Restore issue (XSA-267) (bsc#1095242). - CVE-2018-12891: Fix possible Denial of Service (DoS) via certain PV MMU operations that affect the entire host (XSA-264) (bsc#1097521). - CVE-2018-12892: Fix libxl to honour the readonly flag on HVM emulated SCSI disks (XSA-266) (bsc#1097523). - CVE-2018-12893: Fix crash/Denial of Service (DoS) via safety check (XSA-265) (bsc#1097522). Bug fixes : - bsc#1027519: Add upstream patches from January. - bsc#1098403: Fix regression introduced by changes for bsc#1079730. A PV domU without qcow2 and/or vfb has no qemu attached. Ignore QMP errors for PV domUs to handle PV domUs with and without an attached qemu-xen. - bsc#1087289: Fix xen scheduler crash. This update was imported from the SUSE:SLE-15:Update update project. last seen 2020-06-01 modified 2020-06-02 plugin id 123224 published 2019-03-27 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123224 title openSUSE Security Update : xen (openSUSE-2019-533) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-1981-1.NASL description This update for xen fixes the following issues: Security issues fixed : - CVE-2018-3665: Fix Lazy FP Save/Restore issue (XSA-267) (bsc#1095242). - CVE-2018-12891: Fix possible Denial of Service (DoS) via certain PV MMU operations that affect the entire host (XSA-264) (bsc#1097521). - CVE-2018-12892: Fix libxl to honour the readonly flag on HVM emulated SCSI disks (XSA-266) (bsc#1097523). - CVE-2018-12893: Fix crash/Denial of Service (DoS) via safety check (XSA-265) (bsc#1097522). Bug fixes : - bsc#1027519: Add upstream patches from January. - bsc#1098403: Fix regression introduced by changes for bsc#1079730. A PV domU without qcow2 and/or vfb has no qemu attached. Ignore QMP errors for PV domUs to handle PV domUs with and without an attached qemu-xen. - bsc#1087289: Fix xen scheduler crash. 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 2020-03-21 modified 2019-01-02 plugin id 120050 published 2019-01-02 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/120050 title SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2018:1981-1) NASL family Fedora Local Security Checks NASL id FEDORA_2018-A7862A75F5.NASL description preemption checks bypassed in x86 PV MM handling [XSA-264, CVE-2018-12891] (#1595959) x86: #DB exception safety check can be triggered by a guest [XSA-265, CVE-2018-12893] (#1595958) libxl fails to honour readonly flag on HVM emulated SCSI disks [XSA-266, CVE-2018-12892] (#1595957) 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 2019-01-03 plugin id 120682 published 2019-01-03 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/120682 title Fedora 28 : xen (2018-a7862a75f5) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-4236.NASL description Multiple vulnerabilities have been discovered in the Xen hypervisor : - CVE-2018-12891 It was discovered that insufficient validation of PV MMU operations may result in denial of service. - CVE-2018-12892 It was discovered that libxl fails to honour the last seen 2020-06-01 modified 2020-06-02 plugin id 110787 published 2018-06-29 reporter This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/110787 title Debian DSA-4236-1 : xen - security update NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201810-06.NASL description The remote host is affected by the vulnerability described in GLSA-201810-06 (Xen: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Xen. Please review the referenced CVE identifiers for details. Impact : A local attacker could cause a Denial of Service condition or disclose sensitive information. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 118506 published 2018-10-31 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118506 title GLSA-201810-06 : Xen: Multiple vulnerabilities (Foreshadow) (Meltdown) (Spectre) NASL family SuSE Local Security Checks NASL id OPENSUSE-2018-766.NASL description This update for xen fixes the following issues : Security issues fixed : - CVE-2018-3665: Fix Lazy FP Save/Restore issue (XSA-267) (bsc#1095242). - CVE-2018-12891: Fix possible Denial of Service (DoS) via certain PV MMU operations that affect the entire host (XSA-264) (bsc#1097521). - CVE-2018-12892: Fix libxl to honour the readonly flag on HVM emulated SCSI disks (XSA-266) (bsc#1097523). - CVE-2018-12893: Fix crash/Denial of Service (DoS) via safety check (XSA-265) (bsc#1097522). Bug fixes : - bsc#1027519: Add upstream patches from January. - bsc#1098403: Fix regression introduced by changes for bsc#1079730. A PV domU without qcow2 and/or vfb has no qemu attached. Ignore QMP errors for PV domUs to handle PV domUs with and without an attached qemu-xen. - bsc#1087289: Fix xen scheduler crash. This update was imported from the SUSE:SLE-15:Update update project. last seen 2020-06-05 modified 2018-07-30 plugin id 111418 published 2018-07-30 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/111418 title openSUSE Security Update : xen (openSUSE-2018-766)