CVE-2024-6409

一、漏洞信息
 漏洞编号：[CVE-2024-6409](https://nvd.nist.gov/vuln/detail/CVE-2024-6409)
 漏洞归属组件：[openssh](https://gitee.com/src-openeuler/openssh)
 漏洞归属的版本：8.2p1,8.8p1,9.1p1,9.3p1,9.3p2
 CVSS V3.0分值：
  BaseScore：7.0 High
  Vector：CVSS：3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
 漏洞简述：
  A race condition vulnerability was discovered in how signals are handled by OpenSSH s server (sshd). If a remote attacker does not authenticate within a set time period, then sshd s SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.
 漏洞公开时间：2024-07-09 02:15:09
 漏洞创建时间：2024-07-11 02:05:47
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-6409
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| secalert.redhat.com | http://www.openwall.com/lists/oss-security/2024/07/08/2 |  |
| secalert.redhat.com | http://www.openwall.com/lists/oss-security/2024/07/09/2 |  |
| secalert.redhat.com | http://www.openwall.com/lists/oss-security/2024/07/09/5 |  |
| secalert.redhat.com | http://www.openwall.com/lists/oss-security/2024/07/10/1 |  |
| secalert.redhat.com | http://www.openwall.com/lists/oss-security/2024/07/10/2 |  |
| secalert.redhat.com | https://access.redhat.com/errata/RHSA-2024:4457 |  |
| secalert.redhat.com | https://access.redhat.com/security/cve/CVE-2024-6409 |  |
| secalert.redhat.com | https://almalinux.org/blog/2024-07-09-cve-2024-6409/ |  |
| secalert.redhat.com | https://bugzilla.redhat.com/show_bug.cgi?id=2295085 |  |
| secalert.redhat.com | https://bugzilla.suse.com/show_bug.cgi?id=1227217 |  |
| secalert.redhat.com | https://explore.alas.aws.amazon.com/CVE-2024-6409.html |  |
| secalert.redhat.com | https://github.com/openela-main/openssh/commit/c00da7741d42029e49047dd89e266d91dcfbffa0 |  |
| secalert.redhat.com | https://security-tracker.debian.org/tracker/CVE-2024-6409 |  |
| secalert.redhat.com | https://security.netapp.com/advisory/ntap-20240712-0003/ |  |
| secalert.redhat.com | https://sig-security.rocky.page/issues/CVE-2024-6409/ |  |
| secalert.redhat.com | https://ubuntu.com/security/CVE-2024-6409 |  |
| secalert.redhat.com | https://www.suse.com/security/cve/CVE-2024-6409.html |  |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:4457 | https://bugzilla.redhat.com/show_bug.cgi?id=2295085 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-6409 |
| cve_search |  | https://access.redhat.com/security/cve/CVE-2024-6409 |
| cve_search |  | https://bugzilla.redhat.com/show_bug.cgi?id=2295085 |
| cve_search |  | http://www.openwall.com/lists/oss-security/2024/07/08/2 |
| cve_search |  | https://explore.alas.aws.amazon.com/CVE-2024-6409.html |
| cve_search |  | https://sig-security.rocky.page/issues/CVE-2024-6409/ |
| cve_search |  | https://ubuntu.com/security/CVE-2024-6409 |
| cve_search |  | https://security-tracker.debian.org/tracker/CVE-2024-6409 |
| cve_search |  | http://www.openwall.com/lists/oss-security/2024/07/09/2 |
| cve_search |  | http://www.openwall.com/lists/oss-security/2024/07/09/5 |
| cve_search |  | https://bugzilla.suse.com/show_bug.cgi?id=1227217 |
| cve_search |  | https://www.suse.com/security/cve/CVE-2024-6409.html |
| cve_search |  | https://almalinux.org/blog/2024-07-09-cve-2024-6409/ |
| cve_search |  | http://www.openwall.com/lists/oss-security/2024/07/10/1 |
| cve_search |  | http://www.openwall.com/lists/oss-security/2024/07/10/2 |
| cve_search |  | https://github.com/openela-main/openssh/commit/c00da7741d42029e49047dd89e266d91dcfbffa0 |
| cve_search |  | https://security.netapp.com/advisory/ntap-20240712-0003/ |
| cve_search |  | https://access.redhat.com/errata/RHSA-2024:4457 |
| amazon_linux_explore | https://access.redhat.com/security/cve/CVE-2024-6409 | https://explore.alas.aws.amazon.com/CVE-2024-6409.html |
| amazon_linux_explore | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-6409 | https://explore.alas.aws.amazon.com/CVE-2024-6409.html |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-6409 | https://ubuntu.com/security/CVE-2024-6409 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-6409 | https://ubuntu.com/security/CVE-2024-6409 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-6409 | https://ubuntu.com/security/CVE-2024-6409 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-6409 | https://ubuntu.com/security/CVE-2024-6409 |

</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:
  openBrain开源漏洞感知系统
 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  |
| ------- | -------- | ------- | -------- | --------- |
|  |  | https://github.com/openela-main/openssh/commit/c00da7741d42029e49047dd89e266d91dcfbffa0 |  | secalert.redhat.com |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
    sshd存在信号处理程序竞争条件漏洞，其中客户端在LoginGraceTime秒（默认为120）内未进行身份验证，然后异步调用sshd的SIGALRM处理程序。但是，这个信号处理函数调用了cleanup_exit()函数可能触发以信号处理程序竞争条件的攻击。在最坏的情况下，如果攻击成功，攻击者就能够在运行sshd服务器的非特权用户中执行远程代码执行（RCE）。 
 openEuler评分：
  7.0
 Vector：CVSS：3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-22.03-LTS-SP1(8.8p1):受影响
2.openEuler-22.03-LTS-SP3(8.8p1):受影响
3.openEuler-22.03-LTS-SP4(8.8p1):受影响
4.master(9.3p2):不受影响
5.openEuler-20.03-LTS-SP4(8.2p1):不受影响
6.openEuler-24.03-LTS(9.3p2):不受影响
7.openEuler-24.03-LTS-Next(9.3p2):不受影响

修复是否涉及abi变化(是/否)：
  1.master(9.3p2):否
2.openEuler-20.03-LTS-SP4(8.2p1):否
3.openEuler-22.03-LTS-SP1(8.8p1):否
4.openEuler-22.03-LTS-SP3(8.8p1):否
5.openEuler-22.03-LTS-SP4(8.8p1):否
6.openEuler-24.03-LTS(9.3p2):否
7.openEuler-24.03-LTS-Next(9.3p2):否

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2024-1872

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