All the vulnerabilites related to Go standard library - mime/multipart
cve-2023-24536
Vulnerability from cvelistv5
Published
2023-04-06 15:50
Modified
2024-08-02 11:03
Severity
Summary
Excessive resource consumption in net/http, net/textproto and mime/multipart
References
Impacted products
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"url": "https://pkg.go.dev/vuln/GO-2023-1705"
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"url": "https://security.netapp.com/advisory/ntap-20230526-0007/"
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"url": "https://security.gentoo.org/glsa/202311-09"
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"title": "CVE Program Container"
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"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "mime/multipart",
"product": "mime/multipart",
"programRoutines": [
{
"name": "Reader.readForm"
},
{
"name": "mimeHeaderSize"
},
{
"name": "newPart"
},
{
"name": "Part.populateHeaders"
},
{
"name": "Reader.NextPart"
},
{
"name": "Reader.NextRawPart"
},
{
"name": "Reader.nextPart"
},
{
"name": "readMIMEHeader"
},
{
"name": "Reader.ReadForm"
}
],
"vendor": "Go standard library",
"versions": [
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"lessThan": "1.19.8",
"status": "affected",
"version": "0",
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"status": "affected",
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"collectionURL": "https://pkg.go.dev",
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"packageName": "net/textproto",
"product": "net/textproto",
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"name": "readMIMEHeader"
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"name": "Reader.ReadMIMEHeader"
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"credits": [
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"value": "Jakob Ackermann (@das7pad)"
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"descriptions": [
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"lang": "en",
"value": "Multipart form parsing can consume large amounts of CPU and memory when processing form inputs containing very large numbers of parts. This stems from several causes: 1. mime/multipart.Reader.ReadForm limits the total memory a parsed multipart form can consume. ReadForm can undercount the amount of memory consumed, leading it to accept larger inputs than intended. 2. Limiting total memory does not account for increased pressure on the garbage collector from large numbers of small allocations in forms with many parts. 3. ReadForm can allocate a large number of short-lived buffers, further increasing pressure on the garbage collector. The combination of these factors can permit an attacker to cause an program that parses multipart forms to consume large amounts of CPU and memory, potentially resulting in a denial of service. This affects programs that use mime/multipart.Reader.ReadForm, as well as form parsing in the net/http package with the Request methods FormFile, FormValue, ParseMultipartForm, and PostFormValue. With fix, ReadForm now does a better job of estimating the memory consumption of parsed forms, and performs many fewer short-lived allocations. In addition, the fixed mime/multipart.Reader imposes the following limits on the size of parsed forms: 1. Forms parsed with ReadForm may contain no more than 1000 parts. This limit may be adjusted with the environment variable GODEBUG=multipartmaxparts=. 2. Form parts parsed with NextPart and NextRawPart may contain no more than 10,000 header fields. In addition, forms parsed with ReadForm may contain no more than 10,000 header fields across all parts. This limit may be adjusted with the environment variable GODEBUG=multipartmaxheaders=."
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"url": "https://security.gentoo.org/glsa/202311-09"
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"title": "Excessive resource consumption in net/http, net/textproto and mime/multipart"
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cve-2022-41725
Vulnerability from cvelistv5
Published
2023-02-28 17:19
Modified
2024-08-03 12:49
Severity
Summary
Excessive resource consumption in mime/multipart
References
Impacted products
| Vendor | Product |
|---|---|
| Go standard library | mime/multipart |
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"url": "https://go.dev/cl/468124"
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"url": "https://pkg.go.dev/vuln/GO-2023-1569"
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"url": "https://security.gentoo.org/glsa/202311-09"
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"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "mime/multipart",
"product": "mime/multipart",
"programRoutines": [
{
"name": "Reader.ReadForm"
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"value": "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\u0027s documentation states, \"If stored on disk, the File\u0027s 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."
}
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"title": "Excessive resource consumption in mime/multipart"
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