Vulnerability-Lookup

CNVD-2018-08146

Vulnerability from cnvd - Published: 2018-04-23

Title

Linux kernel拒绝服务漏洞（CNVD-2018-08146）

Description

Linux kernel是一种计算机操作系统内核，以C语言和汇编语言写成，符合POSIX标准，按GNU通用公共许可证发行。 4.15.15及更早版本的Linux kernel存在拒绝服务漏洞。该漏洞产生的原因是Linux kernel中的fs/ext4/xattr.c中的ext4_xattr_check_entries函数未能正确验证xattr大小，这导致将大小错误解释为错误代码。攻击者可通过特制ext4镜像利用该漏洞导致拒绝服务（get_acl空指针解引用和系统崩溃）。

Severity

中

Patch Name

Linux kernel拒绝服务漏洞（CNVD-2018-08146）的补丁

Patch Description

Formal description

厂商已发布漏洞修复程序，请及时关注更新： https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401

Reference

https://nvd.nist.gov/vuln/detail/CVE-2018-1095

Impacted products

Name
Linux Kernel <=4.15.15

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2018-1095"
    }
  },
  "description": "Linux kernel\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\uff0c\u4ee5C\u8bed\u8a00\u548c\u6c47\u7f16\u8bed\u8a00\u5199\u6210\uff0c\u7b26\u5408POSIX\u6807\u51c6\uff0c\u6309GNU\u901a\u7528\u516c\u5171\u8bb8\u53ef\u8bc1\u53d1\u884c\u3002\r\n\r\n4.15.15\u53ca\u66f4\u65e9\u7248\u672c\u7684Linux kernel\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662fLinux kernel\u4e2d\u7684fs/ext4/xattr.c\u4e2d\u7684ext4_xattr_check_entries\u51fd\u6570\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1xattr\u5927\u5c0f\uff0c\u8fd9\u5bfc\u81f4\u5c06\u5927\u5c0f\u9519\u8bef\u89e3\u91ca\u4e3a\u9519\u8bef\u4ee3\u7801\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7279\u5236ext4\u955c\u50cf\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\uff08get_acl\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u548c\u7cfb\u7edf\u5d29\u6e83\uff09\u3002",
  "discovererName": "Wen Xu",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2018-08146",
  "openTime": "2018-04-23",
  "patchDescription": "Linux kernel\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\uff0c\u4ee5C\u8bed\u8a00\u548c\u6c47\u7f16\u8bed\u8a00\u5199\u6210\uff0c\u7b26\u5408POSIX\u6807\u51c6\uff0c\u6309GNU\u901a\u7528\u516c\u5171\u8bb8\u53ef\u8bc1\u53d1\u884c\u3002\r\n\r\n4.15.15\u53ca\u66f4\u65e9\u7248\u672c\u7684Linux kernel\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662fLinux kernel\u4e2d\u7684fs/ext4/xattr.c\u4e2d\u7684ext4_xattr_check_entries\u51fd\u6570\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1xattr\u5927\u5c0f\uff0c\u8fd9\u5bfc\u81f4\u5c06\u5927\u5c0f\u9519\u8bef\u89e3\u91ca\u4e3a\u9519\u8bef\u4ee3\u7801\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7279\u5236ext4\u955c\u50cf\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\uff08get_acl\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u548c\u7cfb\u7edf\u5d29\u6e83\uff09\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Linux kernel\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2018-08146\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Linux Kernel \u003c=4.15.15"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2018-1095",
  "serverity": "\u4e2d",
  "submitTime": "2018-04-02",
  "title": "Linux kernel\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2018-08146\uff09"
}

CVE-2018-1095 (GCVE-0-2018-1095)

Vulnerability from cvelistv5 – Published: 2018-04-02 03:00 – Updated: 2024-08-05 03:51

Summary

The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image.

Severity

No CVSS data available.

CWE

NULL pointer dereference

Assigner

redhat redhat root

References

7 references

URL	Tags
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
http://openwall.com/lists/oss-security/2018/03/29/1	x_refsource_MISC
https://usn.ubuntu.com/3695-1/	vendor-advisoryx_refsource_UBUNTU
https://usn.ubuntu.com/3695-2/	vendor-advisoryx_refsource_UBUNTU
https://access.redhat.com/errata/RHSA-2018:2948	vendor-advisoryx_refsource_REDHAT
https://bugzilla.kernel.org/show_bug.cgi?id=199185	x_refsource_MISC
https://bugzilla.redhat.com/show_bug.cgi?id=1560793	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	Linux kernel through version 4.15	Affected: Linux kernel through version 4.15

Date Public

2018-04-01 00:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T03:51:48.616Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "http://openwall.com/lists/oss-security/2018/03/29/1"
          },
          {
            "name": "USN-3695-1",
            "tags": [
              "vendor-advisory",
              "x_refsource_UBUNTU",
              "x_transferred"
            ],
            "url": "https://usn.ubuntu.com/3695-1/"
          },
          {
            "name": "USN-3695-2",
            "tags": [
              "vendor-advisory",
              "x_refsource_UBUNTU",
              "x_transferred"
            ],
            "url": "https://usn.ubuntu.com/3695-2/"
          },
          {
            "name": "RHSA-2018:2948",
            "tags": [
              "vendor-advisory",
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            ],
            "url": "https://access.redhat.com/errata/RHSA-2018:2948"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugzilla.kernel.org/show_bug.cgi?id=199185"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1560793"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Linux kernel through version 4.15",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "Linux kernel through version 4.15"
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        }
      ],
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          "value": "The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image."
        }
      ],
      "problemTypes": [
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            {
              "description": "NULL pointer dereference",
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              "type": "text"
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      ],
      "providerMetadata": {
        "dateUpdated": "2018-10-31T09:57:01.000Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
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      "references": [
        {
          "tags": [
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          ],
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401"
        },
        {
          "tags": [
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          ],
          "url": "http://openwall.com/lists/oss-security/2018/03/29/1"
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          "tags": [
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          ],
          "url": "https://usn.ubuntu.com/3695-1/"
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          "name": "USN-3695-2",
          "tags": [
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          ],
          "url": "https://usn.ubuntu.com/3695-2/"
        },
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          "name": "RHSA-2018:2948",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
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          "url": "https://access.redhat.com/errata/RHSA-2018:2948"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugzilla.kernel.org/show_bug.cgi?id=199185"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1560793"
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    "datePublished": "2018-04-02T03:00:00.000Z",
    "dateReserved": "2017-12-04T00:00:00.000Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.