CVE-2022-24903— Adiscon Rsyslog 安全漏洞
一分钟漏洞结论
影响对象
rsyslog rsyslog
利用判断
利用概率较高，应尽快评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Adiscon Rsyslog是德国Adiscon公司的一个用于收集系统日志的库。 Adiscon Rsyslog 8.2204.0版本及之前版本存在安全漏洞，该漏洞源于使用八位字节计数的帧时，用于接收 TCP 系统日志的模块会出现堆缓冲区溢出，攻击者利用该漏洞可以破坏堆值，导致数据完整性和可用性。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application
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一、 漏洞 CVE-2022-24903 基础信息
漏洞信息
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Vulnerability Title
Buffer overflow in TCP syslog server (receiver) components in rsyslog
来源: CVE Program / CVE List V5
Vulnerability Description
Rsyslog is a rocket-fast system for log processing. Modules for TCP syslog reception have a potential heap buffer overflow when octet-counted framing is used. This can result in a segfault or some other malfunction. As of our understanding, this vulnerability can not be used for remote code execution. But there may still be a slight chance for experts to do that. The bug occurs when the octet count is read. While there is a check for the maximum number of octets, digits are written to a heap buffer even when the octet count is over the maximum, This can be used to overrun the memory buffer. However, once the sequence of digits stop, no additional characters can be added to the buffer. In our opinion, this makes remote exploits impossible or at least highly complex. Octet-counted framing is one of two potential framing modes. It is relatively uncommon, but enabled by default on receivers. Modules `imtcp`, `imptcp`, `imgssapi`, and `imhttp` are used for regular syslog message reception. It is best practice not to directly expose them to the public. When this practice is followed, the risk is considerably lower. Module `imdiag` is a diagnostics module primarily intended for testbench runs. We do not expect it to be present on any production installation. Octet-counted framing is not very common. Usually, it needs to be specifically enabled at senders. If users do not need it, they can turn it off for the most important modules. This will mitigate the vulnerability.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
来源: CVE Program / CVE List V5
Vulnerability Title
Adiscon Rsyslog 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Adiscon Rsyslog是德国Adiscon公司的一个用于收集系统日志的库。 Adiscon Rsyslog 8.2204.0版本及之前版本存在安全漏洞，该漏洞源于使用八位字节计数的帧时，用于接收 TCP 系统日志的模块会出现堆缓冲区溢出，攻击者利用该漏洞可以破坏堆值，导致数据完整性和可用性。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2022-24903 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
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CVE-2022-24903 补丁与修复 (1)
CVE-2022-24903 厂商安全公告 (3)
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https://www.debian.org/security/2022/dsa-5150 vendor-advisory
CVE-2022-24903 邮件列表归档 (2)
IV. Related Vulnerabilities
V. Comments for CVE-2022-24903
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