CVE-2026-41051 describes a Time-of-Check-Time-of-Use (TOCTOU) vulnerability discovered in csync2. This flaw arises due to the insecure handling of temporary directories when the software is compiled using C99 or later standards. Successful exploitation could allow an attacker to manipulate temporary files, potentially leading to unauthorized access or modification of data. Affected versions include 2.0+git.1600444747.83b3644-3.1–2.0+git.1600444747.83b3644-3.1, with a fix available in version 2.0+git.1600444747.83b3644-3.1.
影响与攻击场景翻译中…
The TOCTOU vulnerability in csync2 allows an attacker to exploit a race condition during the creation and use of temporary files. By manipulating the filesystem between the time a file is checked for existence and the time it is used, an attacker can potentially overwrite or replace critical files with malicious content. This could lead to arbitrary code execution, data corruption, or denial of service. The specific impact depends on how csync2 utilizes these temporary files within its operations. A successful attack could compromise the integrity of the data being synchronized and potentially grant the attacker control over the system running csync2.
利用背景翻译中…
CVE-2026-41051 was published on 2026-05-13. Its severity is currently assessed as Medium (CVSS score of 5). There is no indication of this vulnerability being actively exploited in the wild or appearing on KEV/EPSS. Public proof-of-concept (POC) code is currently unavailable, but the TOCTOU nature of the vulnerability suggests that exploitation is possible with sufficient effort.
威胁情报
漏洞利用状态
CVSS 向量
这些指标意味着什么？
- Attack Vector
- 本地 — 攻击者需要系统上的本地会话或Shell。
- Attack Complexity
- 低 — 无需特殊条件，可以稳定地利用漏洞。
- Privileges Required
- 低 — 任何有效用户账户均可。
- User Interaction
- 需要 — 受害者必须打开文件、点击链接或访问特制页面。
- Scope
- 未改变 — 影响仅限于脆弱组件本身。
- Confidentiality
- 无 — 无机密性影响。
- Integrity
- 无 — 无完整性影响。
- Availability
- 高 — 完全崩溃或资源耗尽，完全拒绝服务。
受影响的软件
时间线
- 已保留
- 发布日期
缓解措施和替代方案翻译中…
The primary mitigation for CVE-2026-41051 is to upgrade to version 2.0+git.1600444747.83b3644-3.1 or later, which contains the fix. If an immediate upgrade is not feasible, consider implementing stricter file permissions on the temporary directories used by csync2 to limit the potential impact of a successful attack. Review the csync2 configuration to ensure that temporary directories are not world-writable. Monitor system logs for any unusual file access patterns or modifications within the temporary directories. After upgrade, confirm the fix by attempting to create a symbolic link to a temporary file while csync2 is running and verifying that the operation fails.
修复方法翻译中…
Actualice a una versión de csync2 posterior a 2.0+git.1600444747.83b3644-3.1 para mitigar el riesgo de ataques TOCTOU en los directorios temporales. La actualización corrige la forma en que se manejan los directorios temporales, previniendo la posibilidad de que un atacante manipule el proceso.
常见问题翻译中…
What is CVE-2026-41051 — TOCTOU in csync2?
CVE-2026-41051 is a Time-of-Check-Time-of-Use vulnerability in csync2, allowing attackers to manipulate temporary files and potentially compromise the system.
Am I affected by CVE-2026-41051 in csync2?
You are affected if you are running csync2 versions 2.0+git.1600444747.83b3644-3.1–2.0+git.1600444747.83b3644-3.1. Check your version with csync2 --version.
How do I fix CVE-2026-41051 in csync2?
Upgrade to version 2.0+git.1600444747.83b3644-3.1 or later. If immediate upgrade isn't possible, restrict permissions on temporary directories.
Is CVE-2026-41051 being actively exploited?
There is currently no public evidence of CVE-2026-41051 being actively exploited, but the TOCTOU nature makes exploitation possible.
Where can I find the official csync2 advisory for CVE-2026-41051?
Refer to the official csync2 project website or relevant security mailing lists for the advisory related to CVE-2026-41051.
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