Vulnerability-Lookup

CNVD-2018-03371

Vulnerability from cnvd - Published: 2018-02-23

Title

systemd访问限制绕过漏洞

Description

systemd是德国软件开发者Lennart Poettering和其他人共同研发的一款基于Linux的系统和服务管理器，它兼容了SysV和LSB的启动脚本，且提供了一个用来表示系统服务间依赖关系的框架。 systemd 237之前版本中的systemd-tmpfiles存在安全漏洞，该漏洞源于fs.protected_hardlinks sysctl在关闭之后，程序仍可更改硬链接文件的所有权/权限。本地攻击者可利用该漏洞绕过访问限制。

Severity

中

Patch Name

systemd访问限制绕过漏洞的补丁

Patch Description

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://github.com/systemd/systemd/pull/7964

Reference

https://github.com/systemd/systemd/issues/7736

Impacted products

Name
systemd systemd <=236

Show details on source website

JSON

To clipboard

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    "cve": {
      "cveNumber": "CVE-2017-18078"
    }
  },
  "description": "systemd\u662f\u5fb7\u56fd\u8f6f\u4ef6\u5f00\u53d1\u8005Lennart Poettering\u548c\u5176\u4ed6\u4eba\u5171\u540c\u7814\u53d1\u7684\u4e00\u6b3e\u57fa\u4e8eLinux\u7684\u7cfb\u7edf\u548c\u670d\u52a1\u7ba1\u7406\u5668\uff0c\u5b83\u517c\u5bb9\u4e86SysV\u548cLSB\u7684\u542f\u52a8\u811a\u672c\uff0c\u4e14\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7528\u6765\u8868\u793a\u7cfb\u7edf\u670d\u52a1\u95f4\u4f9d\u8d56\u5173\u7cfb\u7684\u6846\u67b6\u3002\r\n\r\nsystemd 237\u4e4b\u524d\u7248\u672c\u4e2d\u7684systemd-tmpfiles\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8efs.protected_hardlinks sysctl\u5728\u5173\u95ed\u4e4b\u540e\uff0c\u7a0b\u5e8f\u4ecd\u53ef\u66f4\u6539\u786c\u94fe\u63a5\u6587\u4ef6\u7684\u6240\u6709\u6743/\u6743\u9650\u3002\u672c\u5730\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\u3002",
  "discovererName": "Michael Orlitzky",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://github.com/systemd/systemd/pull/7964",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2018-03371",
  "openTime": "2018-02-23",
  "patchDescription": "systemd\u662f\u5fb7\u56fd\u8f6f\u4ef6\u5f00\u53d1\u8005Lennart Poettering\u548c\u5176\u4ed6\u4eba\u5171\u540c\u7814\u53d1\u7684\u4e00\u6b3e\u57fa\u4e8eLinux\u7684\u7cfb\u7edf\u548c\u670d\u52a1\u7ba1\u7406\u5668\uff0c\u5b83\u517c\u5bb9\u4e86SysV\u548cLSB\u7684\u542f\u52a8\u811a\u672c\uff0c\u4e14\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7528\u6765\u8868\u793a\u7cfb\u7edf\u670d\u52a1\u95f4\u4f9d\u8d56\u5173\u7cfb\u7684\u6846\u67b6\u3002\r\n\r\nsystemd 237\u4e4b\u524d\u7248\u672c\u4e2d\u7684systemd-tmpfiles\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8efs.protected_hardlinks sysctl\u5728\u5173\u95ed\u4e4b\u540e\uff0c\u7a0b\u5e8f\u4ecd\u53ef\u66f4\u6539\u786c\u94fe\u63a5\u6587\u4ef6\u7684\u6240\u6709\u6743/\u6743\u9650\u3002\u672c\u5730\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\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": "systemd\u8bbf\u95ee\u9650\u5236\u7ed5\u8fc7\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "systemd systemd \u003c=236"
  },
  "referenceLink": "https://github.com/systemd/systemd/issues/7736",
  "serverity": "\u4e2d",
  "submitTime": "2018-02-02",
  "title": "systemd\u8bbf\u95ee\u9650\u5236\u7ed5\u8fc7\u6f0f\u6d1e"
}

CVE-2017-18078 (GCVE-0-2017-18078)

Vulnerability from cvelistv5 – Published: 2018-01-29 05:00 – Updated: 2024-08-05 21:13

Summary

systemd-tmpfiles in systemd before 237 attempts to support ownership/permission changes on hardlinked files even if the fs.protected_hardlinks sysctl is turned off, which allows local users to bypass intended access restrictions via vectors involving a hard link to a file for which the user lacks write access, as demonstrated by changing the ownership of the /etc/passwd file.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

9 references

URL	Tags
http://lists.opensuse.org/opensuse-updates/2018-0…	vendor-advisoryx_refsource_SUSE
http://www.openwall.com/lists/oss-security/2018/01/29/3	mailing-listx_refsource_MLIST
https://www.exploit-db.com/exploits/43935/	exploitx_refsource_EXPLOIT-DB
https://github.com/systemd/systemd/issues/7736	x_refsource_MISC
http://packetstormsecurity.com/files/146184/syste…	x_refsource_MISC
https://www.openwall.com/lists/oss-security/2018/…	mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2019…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf4c02775860…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r58af02e294b…	mailing-listx_refsource_MLIST

Date Public

2018-01-28 00:00

Show details on NVD website

JSON

To clipboard

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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.

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.

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Action not permitted

CNVD-2018-03371

CVE-2017-18078 (GCVE-0-2017-18078)

Tags

Sightings

Nomenclature

Related by attack behaviour