CVE-2019-3822

描述

libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.

如何修補 CVE-2019-3822

要修補 CVE-2019-3822,請將受影響套件升級到下列已修補版本。

• —升級至 7.64.0-r0 或更新版本
• —升級至 7.64.0-1 或更新版本

CVE-2019-3822 正在被利用嗎?

中等 — EPSS 為 12.8%,可持續追蹤但非最高優先。

受影響套件(2)

• from 0, < 7.64.0-r0
• from 0, < 7.64.0-1

CVSS 分數

參考連結(2)

• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-3822
• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-3822