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{"id": "REDHAT-RHSA-2017-1488.NASL", "vendorId": null, "type": "nessus", "bulletinFamily": "scanner", "title": "RHEL 6 : kernel (RHSA-2017:1488) (Stack Clash)", "description": "An update for kernel is now available for Red Hat Enterprise Linux 6.6 Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco Extended Update Support.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.\n\nThe kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es) :\n\n* A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult.\n(CVE-2017-1000364, Important)\n\n* A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system.\n(CVE-2017-2636, Important)\n\nRed Hat would like to thank Qualys Research Labs for reporting CVE-2017-1000364 and Alexander Popov for reporting CVE-2017-2636.\n\nBug Fix(es) :\n\n* Previously, the kdump mechanism was trying to get the lock by the vmalloc_sync_all() function during a kernel panic. Consequently, a deadlock occurred, and the crashkernel did not boot. This update fixes the vmalloc_sync_all() function to avoid synchronizing the vmalloc area on the crashing CPU. As a result, the crashkernel parameter now boots as expected, and the kernel dump is collected successfully under the described circumstances. (BZ#1443497)\n\n* Previously, a kernel panic occurred when the mcelog daemon executed a huge page memory offline. This update fixes the HugeTLB feature of the Linux kernel to check for the Page Table Entry (PTE) NULL pointer in the page_check_address() function. As a result, the kernel panic no longer occurs under the described circumstances. (BZ#1444349)\n\n* Previously, the vmw_pvscsi driver reported most successful aborts as FAILED due to a bug in vmw_pvscsi abort handler. This update fixes the handler, and successful aborts are no longer reported as FAILED.\n(BZ#1442966)", "published": "2017-06-20T00:00:00", "modified": "2019-10-24T00:00:00", "epss": [{"cve": "CVE-2017-1000364", "epss": 0.00241, "percentile": 0.61789, "modified": "2023-12-03"}, {"cve": "CVE-2017-1000379", "epss": 0.00064, "percentile": 0.26459, "modified": "2023-12-03"}, {"cve": "CVE-2017-2636", "epss": 0.00044, "percentile": 0.08137, "modified": "2023-12-03"}], "cvss": {"score": 0.0, "vector": "NONE"}, "cvss2": {}, "cvss3": {}, "href": "https://www.tenable.com/plugins/nessus/100898", "reporter": "This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.", "references": ["http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2636", "https://access.redhat.com/errata/RHSA-2017:1488", "https://access.redhat.com/security/vulnerabilities/stackguard", "https://access.redhat.com/security/cve/cve-2017-2636", "http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1000364", "https://access.redhat.com/security/cve/cve-2017-1000364", "http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1000379", "https://access.redhat.com/security/cve/cve-2017-1000379"], "cvelist": ["CVE-2017-1000364", "CVE-2017-1000379", "CVE-2017-2636"], "immutableFields": [], "lastseen": "2023-12-02T15:34:29", "viewCount": 27, "enchantments": {"dependencies": {"references": [{"type": "amazon", "idList": ["ALAS-2017-845"]}, {"type": "archlinux", "idList": ["ASA-201703-13", "ASA-201703-6", "ASA-201703-7", "ASA-201703-8", "ASA-201706-28", "ASA-201706-30", "ASA-201706-31"]}, {"type": "avleonov", "idList": ["AVLEONOV:258C4C7C6D4C10965793FFCDA8860939"]}, {"type": "centos", "idList": ["CESA-2017:0892", "CESA-2017:0933", "CESA-2017:1484", "CESA-2017:1486", "CESA-2017:1842"]}, {"type": "cloudfoundry", "idList": ["CFOUNDRY:CAC337307F043175ACEEE3B0FD0416FF", "CFOUNDRY:EC22D7C9EDB0A72523F94F026F02A4D4"]}, {"type": "cve", "idList": 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(CVE-2017-1000364, Important)\n\nRed Hat would like to thank Qualys Research Labs for reporting this issue.", "cvss3": {"exploitabilityScore": 1.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 7.8, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-06-19T15:03:58", "type": "redhat", "title": "(RHSA-2017:1487) Important: kernel security update", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": true, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-1000364", "CVE-2017-1000379"], "modified": "2017-08-29T05:34:41", "id": "RHSA-2017:1487", "href": "https://access.redhat.com/errata/RHSA-2017:1487", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-11-29T10:41:39", "description": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* A flaw was found in the way memory was being allocated on the stack for user space binaries. 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(BZ#1444342)\n\n* Previously, the kdump mechanism was trying to get the lock by the vmalloc_sync_all() function during a kernel panic. Consequently, a deadlock occurred, and the crashkernel did not boot. This update fixes the vmalloc_sync_all() function to avoid synchronizing the vmalloc area on the crashing CPU. As a result, the crashkernel parameter now boots as expected, and the kernel dump is collected successfully under the described circumstances. 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If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult. (CVE-2017-1000364, Important)\n\n* The NFS2/3 RPC client could send long arguments to the NFS server. These encoded arguments are stored in an array of memory pages, and accessed using pointer variables. Arbitrarily long arguments could make these pointers point outside the array and cause an out-of-bounds memory access. A remote user or program could use this flaw to crash the kernel, resulting in denial of service. (CVE-2017-7645, Important)\n\n* The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lacked certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly cause other unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important)\n\n* A flaw was found in the Linux kernel's handling of packets with the URG flag. Applications using the splice() and tcp_splice_read() functionality could allow a remote attacker to force the kernel to enter a condition in which it could loop indefinitely. (CVE-2017-6214, Moderate)\n\nRed Hat would like to thank Qualys Research Labs for reporting CVE-2017-1000364 and Ari Kauppi for reporting CVE-2017-7895.\n\nBug Fix(es):\n\n* kernel-rt packages have been upgraded to the 3.10.0-514 source tree, which provides a number of bug fixes over the previous version. 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(CVE-2017-2636, Important)\n\nRed Hat would like to thank Alexander Popov for reporting this issue.", "cvss3": {"exploitabilityScore": 1.0, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 7.0, "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-05-16T09:06:20", "type": "redhat", "title": "(RHSA-2017:1233) Important: kernel security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.4, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 6.9, "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-2636"], "modified": "2017-05-16T09:14:09", "id": "RHSA-2017:1233", "href": "https://access.redhat.com/errata/RHSA-2017:1233", "cvss": {"score": 6.9, "vector": "AV:L/AC:M/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-11-29T10:41:39", "description": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. 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