multipart 拒绝服务漏洞(CVE-2022-41725)

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2023-11-30 03:31:40 Ali_nvd 来源：ZONE.CI 全球网 0 阅读模式

中危 multipart 拒绝服务漏洞(CVE-2022-41725)

CVE编号

CVE-2022-41725

利用情况

暂无

补丁情况

官方补丁

披露时间

2023-02-21

漏洞描述

A denial of service is possible from excessive resource consumption in net/http and mime/multipart. Multipart form parsing with mime/multipart.Reader.ReadForm can consume largely unlimited amounts of memory and disk files. This also affects form parsing in the net/http package with the Request methods FormFile, FormValue, ParseMultipartForm, and PostFormValue. ReadForm takes a maxMemory parameter, and is documented as storing "up to maxMemory bytes +10MB (reserved for non-file parts) in memory". File parts which cannot be stored in memory are stored on disk in temporary files. The unconfigurable 10MB reserved for non-file parts is excessively large and can potentially open a denial of service vector on its own. However, ReadForm did not properly account for all memory consumed by a parsed form, such as map entry overhead, part names, and MIME headers, permitting a maliciously crafted form to consume well over 10MB. In addition, ReadForm contained no limit on the number of disk files created, permitting a relatively small request body to create a large number of disk temporary files. With fix, ReadForm now properly accounts for various forms of memory overhead, and should now stay within its documented limit of 10MB + maxMemory bytes of memory consumption. Users should still be aware that this limit is high and may still be hazardous. In addition, ReadForm now creates at most one on-disk temporary file, combining multiple form parts into a single temporary file. The mime/multipart.File interface type's documentation states, "If stored on disk, the File's underlying concrete type will be an *os.File.". This is no longer the case when a form contains more than one file part, due to this coalescing of parts into a single file. The previous behavior of using distinct files for each form part may be reenabled with the environment variable GODEBUG=multipartfiles=distinct. Users should be aware that multipart.ReadForm and the http.Request methods that call it do not limit the amount of disk consumed by temporary files. Callers can limit the size of form data with http.MaxBytesReader.

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://go.dev/cl/468124
https://go.dev/issue/58006
https://groups.google.com/g/golang-announce/c/V0aBFqaFs_E
https://pkg.go.dev/vuln/GO-2023-1569
https://security.gentoo.org/glsa/202311-09

受影响软件情况

1
#	类型	厂商	产品	版本	影响面
	运行在以下环境
	应用	golang	go	*		Up to (excluding) 1.19.6
	运行在以下环境
	应用	golang	go	1.20.0	-
	运行在以下环境
	系统	alpine_3.17	go	*		Up to (excluding) 1.19.6-r0
	运行在以下环境
	系统	alpine_3.18	go	*		Up to (excluding) 1.20.1-r0
	运行在以下环境
	系统	alpine_edge	go	*		Up to (excluding) 1.20.1-r0
	运行在以下环境
	系统	amazon_2	golang	*		Up to (excluding) 1.6.19-1.amzn2.0.2
	运行在以下环境
	系统	amazon_2023	golang	*		Up to (excluding) 1.19.8-1.amzn2023.0.1
	运行在以下环境
	系统	amazon_AMI	golang	*		Up to (excluding) 1.18.6-1.43.amzn1
	运行在以下环境
	系统	debian_10	golang-1.11	*		Up to (including) 1.11.6-1+deb10u4
	运行在以下环境
	系统	debian_11	golang-1.15	*		Up to (including) 1.15.15-1~deb11u4
	运行在以下环境
	系统	debian_12	golang-1.19	*		Up to (excluding) 1.19.6-2
	运行在以下环境
	系统	debian_sid	golang-1.19	*		Up to (excluding) 1.19.6-2
	运行在以下环境
	系统	fedora_EPEL_7	golang	*		Up to (excluding) 1.19.6-1.el7
	运行在以下环境
	系统	opensuse_Leap_15.4	go1.19-doc	*		Up to (excluding) 1.18.10.1-150000.1.9.1
	运行在以下环境
	系统	opensuse_Leap_15.5	go1.18-openssl	*		Up to (excluding) 1.18.10.1-150000.1.9.1
	运行在以下环境
	系统	oracle_8	oraclelinux-release	*		Up to (excluding) 1.19.6-1.module+el8.8.0+21053+7bf42711
	运行在以下环境
	系统	ubuntu_22.10	golang-1.19	*		Up to (excluding) 1.19.2-1ubuntu1.1
	运行在以下环境
	系统	unionos_e	golang	*		Up to (excluding) golang-1.15.7-24.up1.uel20