Headline
CVE-2022-41724: [security] Go 1.20.1 and Go 1.19.6 are released
Large handshake records may cause panics in crypto/tls. Both clients and servers may send large TLS handshake records which cause servers and clients, respectively, to panic when attempting to construct responses. This affects all TLS 1.3 clients, TLS 1.2 clients which explicitly enable session resumption (by setting Config.ClientSessionCache to a non-nil value), and TLS 1.3 servers which request client certificates (by setting Config.ClientAuth >= RequestClientCert).
anno…@golang.org
unread,
Feb 14, 2023, 7:22:23 PMFeb 14
to golan…@googlegroups.com
Hello gophers,
We have just released Go versions 1.20.1 and 1.19.6, minor point releases.
These minor releases include 4 security fixes following the security policy:
path/filepath: path traversal in filepath.Clean on Windows
On Windows, the filepath.Clean function could transform an invalid path such as a/…/c:/b into the valid path c:\b. This transformation of a relative (if invalid) path into an absolute path could enable a directory traversal attack. The filepath.Clean function will now transform this path into the relative (but still invalid) path .\c:\b.
Thanks to RyotaK (https://ryotak.net) for reporting this issue.
This is CVE-2022-41722 and Go issue https://go.dev/issue/57274.
net/http, mime/multipart: denial of service from excessive resource consumption
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.
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.
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.
Thanks to Ameya Darshan and Jakob Ackermann (@das7pad) for reporting this issue.
This is CVE-2022-41725 and Go issue https://go.dev/issue/58006.
crypto/tls: large handshake records may cause panics
Both clients and servers may send large TLS handshake records which cause servers and clients,
respectively, to panic when attempting to construct responses.This affects all TLS 1.3 clients, TLS 1.2 clients which explicitly enable session resumption
(by setting Config.ClientSessionCache to a non-nil value), and TLS 1.3 servers which request
client certificates (by setting Config.ClientAuth >= RequestClientCert).Thanks to Marten Seemann for reporting this issue.
This is CVE-2022-41724 and Go issue https://go.dev/issue/58001.
net/http: avoid quadratic complexity in HPACK decoding
A maliciously crafted HTTP/2 stream could cause excessive CPU consumption in the HPACK decoder, sufficient to cause a denial of service from a small number of small requests.
This issue is also fixed in golang.org/x/net/http2 v0.7.0, for users manually configuring HTTP/2.
Thanks to Philippe Antoine (Catena cyber) for reporting this issue.
This is CVE-2022-41723 and Go issue https://go.dev/issue/57855.
View the release notes for more information:
https://go.dev/doc/devel/release#go1.20.1
You can download binary and source distributions from the Go website:
https://go.dev/dl/
To compile from source using a Git clone, update to the release with
git checkout go1.20.1 and build as usual.
Thanks to everyone who contributed to the releases.
Cheers,
Michael and Than for the Go team
Roland Shoemaker
unread,
Feb 15, 2023, 6:31:13 PM (13 days ago) Feb 15
to golang-announce
Hey all,
When writing the release note for the net/http and mime/multipart security fix (CVE-2022-41725), we mixed up two earlier reports about a similar issue and credited the incorrect reporter.
The credit should go to Arpad Ryszka and Jakob Ackermann. We apologize for this mixup, and want to say thanks again to everyone who reports security issues to the project!
Cheers,
Roland on behalf of the Go Security team
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An update for the go-toolset:rhel8 module is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2022-41724: A flaw was found in Golang Go, where it is vulnerable to a denial of service caused when processing large TLS handshake records. By sending specially-crafted TLS handshake records, a remote, authenticated attacker can cause a denial of service condition. * CVE-2022-41725: A flaw was found in Go, where it is vulnerable to a den...
Red Hat Security Advisory 2023-2107-01 - The Migration Toolkit for Containers (MTC) 1.7.9 is now available. Red Hat Product Security has rated this update as having a security impact of Moderate. Issues addressed include a denial of service vulnerability.
The Migration Toolkit for Containers (MTC) 1.7.9 is now available. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2022-41724: A flaw was found in Golang Go, where it is vulnerable to a denial of service caused when processing large TLS handshake records. By sending specially-crafted TLS handshake records, a remote, authenticated attacker can cause a denial of service condition. * CVE-2022-41725: A flaw was found in Go, where it is vulnerable to a denial of service caused by...
Red Hat Security Advisory 2023-1817-01 - Network Observability 1.2.0 is an OpenShift operator that provides a monitoring pipeline to collect and enrich network flows that are produced by the Network observability eBPF agent. The operator provides dashboards, metrics, and keeps flows accessible in a queryable log store, Grafana Loki. When a FlowCollector is deployed, new dashboards are available in the Console. This update contains bug fixes. Issues addressed include a denial of service vulnerability.
Red Hat Security Advisory 2023-1639-01 - OpenShift API for Data Protection enables you to back up and restore application resources, persistent volume data, and internal container images to external backup storage. OADP enables both file system-based and snapshot-based backups for persistent volumes. Issues addressed include a denial of service vulnerability.
OpenShift API for Data Protection (OADP) 1.1.3 is now available. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2022-41724: A flaw was found in Golang Go, where it is vulnerable to a denial of service caused when processing large TLS handshake records. By sending specially-crafted TLS handshake records, a remote, authenticated attacker can cause a denial of service condition. * CVE-2022-41725: A flaw was found in Go, where it is vulnerable to a denial of service caused by a...
A maliciously crafted HTTP/2 stream could cause excessive CPU consumption in the HPACK decoder, sufficient to cause a denial of service from a small number of small requests.
A path traversal vulnerability exists in filepath.Clean on Windows. On Windows, the filepath.Clean function could transform an invalid path such as "a/../c:/b" into the valid path "c:\b". This transformation of a relative (if invalid) path into an absolute path could enable a directory traversal attack. After fix, the filepath.Clean function transforms this path into the relative (but still invalid) path ".\c:\b".
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 cr...
A maliciously crafted HTTP/2 stream could cause excessive CPU consumption in the HPACK decoder, sufficient to cause a denial of service from a small number of small requests.