CVE-2023-4091

一、漏洞信息
 漏洞编号：[CVE-2023-4091](https://nvd.nist.gov/vuln/detail/CVE-2023-4091)
 漏洞归属组件：[samba](https://gitee.com/src-openeuler/samba)
 漏洞归属的版本：4.11.12,4.12.5,4.15.3,4.16.4,4.17.2,4.17.5,4.18.5
 CVSS V3.0分值：
  BaseScore：5.4 Medium
  Vector：CVSS：3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
 漏洞简述：
  A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module  acl_xattr  is configured with  acl_xattr:ignore system acls = yes . The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba s permissions.
 漏洞公开时间：2023-10-12 03:20:27
 漏洞创建时间：2023-10-12 05:11:42
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2023-4091
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| redhat_bugzilla | https://bugzilla.samba.org/show_bug.cgi?id=15439 | https://bugzilla.redhat.com/show_bug.cgi?id=2241882 |
| redhat_bugzilla | https://www.samba.org/samba/security/CVE-2023-4091.html | https://bugzilla.redhat.com/show_bug.cgi?id=2241882 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2023-4091 |
| samba |  | https://www.samba.org//samba/security/CVE-2023-3961.html |
| samba |  | https://www.samba.org//samba/security/CVE-2023-4154.html |
| samba |  | https://www.samba.org//samba/security/CVE-2023-4091.html |
| samba |  | https://www.samba.org//samba/security/CVE-2023-42669.html |
| samba |  | https://www.samba.org//samba/security/CVE-2023-42670.html |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2023-4091 |
| amazon_linux_explore | https://access.redhat.com/security/cve/CVE-2023-4091 | https://explore.alas.aws.amazon.com/CVE-2023-4091.html |
| amazon_linux_explore | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4091 | https://explore.alas.aws.amazon.com/CVE-2023-4091.html |
| snyk | https://bugzilla.redhat.com/show_bug.cgi?id=2241882 | https://security.snyk.io/vuln/SNYK-UNMANAGED-SAMBA-5961564 |
| snyk | https://www.samba.org/samba/security/CVE-2023-4091.html | https://security.snyk.io/vuln/SNYK-UNMANAGED-SAMBA-5961564 |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  其它
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
| samba | 4.19.1 | https://download.samba.orghttps://download.samba.org/pub/samba/ftp/patches/security/samba-4.19.1-security-2023-10-10.patch |  | samba |
| samba | 4.18.8 | https://download.samba.orghttps://download.samba.org/pub/samba/ftp/patches/security/samba-4.18.8-security-2023-10-10.patch |  | samba |
| samba | 4.17.12 | https://download.samba.orghttps://download.samba.org/pub/samba/ftp/patches/security/samba-4.17.12-security-2023-10-10.patch |  | samba |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
      由于缺少只读访问检查，SMB客户端可以截断具有只读权限的文件，将文件截断为0字节。  
 openEuler评分：
  6.5
 Vector：CVSS：3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP1(4.11.12):受影响
2.openEuler-20.03-LTS-SP3(4.11.12):受影响
3.openEuler-20.03-LTS-SP4:受影响
4.openEuler-22.03-LTS(4.15.3):受影响
5.openEuler-22.03-LTS-SP1(4.17.2):受影响
6.openEuler-22.03-LTS-SP2(4.17.5):受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP1(4.11.12):否
2.openEuler-20.03-LTS-SP3(4.11.12):否
3.openEuler-20.03-LTS-SP4:否
4.openEuler-22.03-LTS(4.15.3):否
5.openEuler-22.03-LTS-SP1(4.17.2):否
6.openEuler-22.03-LTS-SP2(4.17.5):否

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2023-1757

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