CVE-2025-43857

一、漏洞信息
 漏洞编号：[CVE-2025-43857](https://nvd.nist.gov/vuln/detail/CVE-2025-43857)
 漏洞归属组件：[ruby](https://gitee.com/src-openeuler/ruby)
 漏洞归属的版本：2.5.8,3.0.3,3.2.7
 CVSS V3.0分值：
  BaseScore：7.5 High
  Vector：CVSS：3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
 漏洞简述：
  Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a  literal  byte count, which is automatically read by the client s receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well-behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5.
 漏洞公开时间：2025-04-29 00:15:33
 漏洞创建时间：2025-05-23 11:17:27
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-43857
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| security-advisories.github.com | https://github.com/ruby/net-imap/pull/442 |  |
| security-advisories.github.com | https://github.com/ruby/net-imap/pull/444/commits/0ae8576c1a90bcd9573f81bdad4b4b824642d105#diff-53721cb4d9c3fb86b95cc8476ca2df90968ad8c481645220c607034399151462 |  |
| security-advisories.github.com | https://github.com/ruby/net-imap/pull/445 |  |
| security-advisories.github.com | https://github.com/ruby/net-imap/pull/446 |  |
| security-advisories.github.com | https://github.com/ruby/net-imap/pull/447 |  |
| security-advisories.github.com | https://github.com/ruby/net-imap/security/advisories/GHSA-j3g3-5qv5-52mj |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2025-43857 | https://bugzilla.suse.com/show_bug.cgi?id=1241998 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2025-43857 | https://bugzilla.suse.com/show_bug.cgi?id=1241998 |
| suse_bugzilla | https://github.com/ruby/net-imap/pull/442 | https://bugzilla.suse.com/show_bug.cgi?id=1241998 |
| suse_bugzilla | https://github.com/ruby/net-imap/pull/444/commits/0ae8576c1a90bcd9573f81bdad4b4b824642d105#diff-53721cb4d9c3fb86b95cc8476ca2df90968ad8c481645220c607034399151462 | https://bugzilla.suse.com/show_bug.cgi?id=1241998 |
| suse_bugzilla | https://github.com/ruby/net-imap/pull/445 | https://bugzilla.suse.com/show_bug.cgi?id=1241998 |
| suse_bugzilla | https://github.com/ruby/net-imap/pull/446 | https://bugzilla.suse.com/show_bug.cgi?id=1241998 |
| suse_bugzilla | https://github.com/ruby/net-imap/pull/447 | https://bugzilla.suse.com/show_bug.cgi?id=1241998 |
| suse_bugzilla | https://github.com/ruby/net-imap/security/advisories/GHSA-j3g3-5qv5-52mj | https://bugzilla.suse.com/show_bug.cgi?id=1241998 |
| ruby |  | https://github.com/rubysec/ruby-advisory-db/gems/net-imap/CVE-2025-43857.yml |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2025-43857 |
| amazon_linux_explore | https://access.redhat.com/security/cve/CVE-2025-43857 | https://explore.alas.aws.amazon.com/CVE-2025-43857.html |
| amazon_linux_explore | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-43857 | https://explore.alas.aws.amazon.com/CVE-2025-43857.html |

</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/ruby/net-imap/pull/442 |  | security-advisories.github.com |
|  |  | https://github.com/ruby/net-imap/pull/444/commits/0ae8576c1a90bcd9573f81bdad4b4b824642d105#diff-53721cb4d9c3fb86b95cc8476ca2df90968ad8c481645220c607034399151462 |  | security-advisories.github.com |
|  |  | https://github.com/ruby/net-imap/pull/445 |  | security-advisories.github.com |
|  |  | https://github.com/ruby/net-imap/pull/446 |  | security-advisories.github.com |
|  |  | https://github.com/ruby/net-imap/pull/447 |  | security-advisories.github.com |
|  |  | https://github.com/ruby/net-imap/pull/442 |  | suse_bugzilla |
|  |  | https://github.com/ruby/net-imap/pull/444/commits/0ae8576c1a90bcd9573f81bdad4b4b824642d105#diff-53721cb4d9c3fb86b95cc8476ca2df90968ad8c481645220c607034399151462 |  | suse_bugzilla |
|  |  | https://github.com/ruby/net-imap/pull/445 |  | suse_bugzilla |
|  |  | https://github.com/ruby/net-imap/pull/446 |  | suse_bugzilla |
|  |  | https://github.com/ruby/net-imap/pull/447 |  | suse_bugzilla |
|  |  | https://github.com/ruby/net-imap/pull/442 |  | nvd |
|  |  | https://github.com/ruby/net-imap/pull/444/commits/0ae8576c1a90bcd9573f81bdad4b4b824642d105#diff-53721cb4d9c3fb86b95cc8476ca2df90968ad8c481645220c607034399151462 |  | nvd |
|  |  | https://github.com/ruby/net-imap/pull/445 |  | nvd |
|  |  | https://github.com/ruby/net-imap/pull/446 |  | nvd |
|  |  | https://github.com/ruby/net-imap/pull/447 |  | nvd |
|  |  | https://github.com/ruby/net-imap/security/advisories/GHSA-j3g3-5qv5-52mj |  | nvd |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
  当客户端连接到 IMAP 服务器时，服务器可能会发送一个 “literal”响应，其中包含一个字节数。这个字节数告诉客户端需要读取多少字节的数据。客户端的接收线程会立即分配内存来存储这个数量的字节。如果恶意服务器发送一个非常大的字节数（例如 1GB 或更大），客户端就会尝试分配大量内存。如果内存不足，会导致程序崩溃或系统资源耗尽，造成拒绝服务。
 openEuler评分：
  7.5
 Vector：CVSS：3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
 受影响版本排查(受影响/不受影响)：
  1.master(3.2.8):受影响
2.openEuler-20.03-LTS-SP4(2.5.8):受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.openEuler-24.03-LTS:受影响
6.openEuler-24.03-LTS-Next:受影响
7.openEuler-24.03-LTS-SP1:受影响
8.openEuler-24.03-LTS-SP2:受影响

修复是否涉及abi变化(是/否)：
  1.master(3.2.8):否
2.openEuler-20.03-LTS-SP4(2.5.8):否
3.openEuler-22.03-LTS-SP3:否
4.openEuler-22.03-LTS-SP4:否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-24.03-LTS-SP1:否
8.openEuler-24.03-LTS-SP2:否

原因说明：
  1.master(3.2.8):正常修复
2.openEuler-20.03-LTS-SP4(2.5.8):正常修复
3.openEuler-22.03-LTS-SP3:正常修复
4.openEuler-22.03-LTS-SP4:正常修复
5.openEuler-24.03-LTS:正常修复
6.openEuler-24.03-LTS-Next:正常修复
7.openEuler-24.03-LTS-SP1:正常修复
8.openEuler-24.03-LTS-SP2:正常修复

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2025-1640

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