CVE-2021-3634 (CNNVD-202108-2375)
中文标题:
Libssh 缓冲区错误漏洞
英文标题:
A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shar...
漏洞描述
中文描述:
Libssh是Libssh组织的一个用于访问SSH服务的C语言开发包，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh 存在缓冲区错误漏洞，该漏洞源于 libssh 允许在密钥重新交换操作中改变密钥交换方法。改变密钥交换方法时，如果采用不同长度的 hash ，将会导致缓冲区错误。
英文描述:
A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shared secrets during the lifetime of the session. One of them is called secret_hash and the other session_id. Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked as long as these buffers were same. But the key re-exchange operation can also change the key exchange method, which can be based on hash of different size, eventually creating "secret_hash" of different size than the session_id has. This becomes an issue when the session_id memory is zeroed or when it is used again during second key re-exchange.
CWE类型:
标签:
受影响产品
| 厂商 | 产品 | 版本 | 版本范围 | 平台 | CPE |
|---|---|---|---|---|---|
| libssh | libssh | * | - | - |
cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
|
| redhat | virtualization | 4.0 | - | - |
cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:*
|
| redhat | enterprise_linux | 8.0 | - | - |
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*
|
| debian | debian_linux | 10.0 | - | - |
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
|
| debian | debian_linux | 11.0 | - | - |
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
|
| fedoraproject | fedora | 33 | - | - |
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
|
| fedoraproject | fedora | 34 | - | - |
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
|
| fedoraproject | fedora | 35 | - | - |
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
|
| oracle | mysql_workbench | * | - | - |
cpe:2.3:a:oracle:mysql_workbench:*:*:*:*:*:*:*:*
|
| netapp | cloud_backup | - | - | - |
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
|
解决方案
中文解决方案:
英文解决方案:
临时解决方案:
CVSS评分详情
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
时间信息
利用信息
数据源详情
| 数据源 | 记录ID | 版本 | 提取时间 |
|---|---|---|---|
| CVE | cve_CVE-2021-3634 |
2025-11-11 15:21:05 | 2025-11-11 07:36:57 |
| NVD | nvd_CVE-2021-3634 |
2025-11-11 14:57:41 | 2025-11-11 07:45:15 |
| CNNVD | cnnvd_CNNVD-202108-2375 |
2025-11-11 15:10:42 | 2025-11-11 07:56:52 |
版本与语言
安全公告
变更历史
查看详细变更
- vulnerability_type: 未提取 -> 缓冲区错误
- cnnvd_id: 未提取 -> CNNVD-202108-2375
- data_sources: ['cve', 'nvd'] -> ['cnnvd', 'cve', 'nvd']
查看详细变更
- cvss_score: 未提取 -> 6.5
- cvss_vector: NOT_EXTRACTED -> CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- cvss_version: NOT_EXTRACTED -> 3.1
- affected_products_count: 0 -> 10
- data_sources: ['cve'] -> ['cve', 'nvd']