Sourced from The GitHub Security Advisory Database.

Local Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary files

Impact

When netty's multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled.

The CVSSv3.1 score of this vulnerability is calculated to be a 6.2/10

Vulnerability Details

On unix-like systems, the temporary directory is shared between all user. As such, writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note, this does not impact modern MacOS Operating Systems.

The method File.createTempFile on unix-like systems creates a random file, but, by default will create this file with the permissions -rw-r--r--. Thus, if sensitive information is written to this file, other local users can read this information.

This is the case in netty's AbstractDiskHttpData is vulnerable.

https://github.com/netty/netty/blob/e5951d46fc89db507ba7d2968d2ede26378f0b04/codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractDiskHttpData.java#L80-L101

AbstractDiskHttpData is used as a part of the DefaultHttpDataFactory class which is used by HttpPostRequestDecoder / HttpPostMultiPartRequestDecoder.

You may be affected by this vulnerability your project contains the following code patterns:

... (truncated)

Affected versions: < 4.1.59

• 67bedf0 [maven-release-plugin] prepare release netty-4.1.64.Final
• c226426 Add script to copy apidocs and xref to netty-website
• 060889d Fix another typo in the release workflow
• 9ca4e21 Fix typo in release workflow
• 78050c5 Don't create a new ParserImpl on each parser() call (#11255)
• 265b2ea Fix typo in DnsCodecUtil class (#11252)
• fa8f7a3 Add DefaultHostsFileEntriesResolver#addresses to provide all hosts file's ent...
• 11e6a77 Change asterisk to 'x' in FQDN of SelfSignedCertificate (#11245)
• c443bc4 Use MAVEN_OPTS to setup timeouts for dependency downloads (#11250)
• d0b7f76 Use tasks by default when using openssl based SSL provider (#11242)
• Additional commits viewable in compare view

Sourced from The GitHub Security Advisory Database.

Denial of Service in Netty The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.

Affected versions: >= 4.1.0, < 4.1.46

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects io.netty:netty-handler HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.

Affected versions: < 4.1.45

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects io.netty:netty-handler HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."

Affected versions: < 4.1.44

• 67bedf0 [maven-release-plugin] prepare release netty-4.1.64.Final
• c226426 Add script to copy apidocs and xref to netty-website
• 060889d Fix another typo in the release workflow
• 9ca4e21 Fix typo in release workflow
• 78050c5 Don't create a new ParserImpl on each parser() call (#11255)
• 265b2ea Fix typo in DnsCodecUtil class (#11252)
• fa8f7a3 Add DefaultHostsFileEntriesResolver#addresses to provide all hosts file's ent...
• 11e6a77 Change asterisk to 'x' in FQDN of SelfSignedCertificate (#11245)
• c443bc4 Use MAVEN_OPTS to setup timeouts for dependency downloads (#11250)
• d0b7f76 Use tasks by default when using openssl based SSL provider (#11242)
• Additional commits viewable in compare view

• 67bedf0 [maven-release-plugin] prepare release netty-4.1.64.Final
• c226426 Add script to copy apidocs and xref to netty-website
• 060889d Fix another typo in the release workflow
• 9ca4e21 Fix typo in release workflow
• 78050c5 Don't create a new ParserImpl on each parser() call (#11255)
• 265b2ea Fix typo in DnsCodecUtil class (#11252)
• fa8f7a3 Add DefaultHostsFileEntriesResolver#addresses to provide all hosts file's ent...
• 11e6a77 Change asterisk to 'x' in FQDN of SelfSignedCertificate (#11245)
• c443bc4 Use MAVEN_OPTS to setup timeouts for dependency downloads (#11250)
• d0b7f76 Use tasks by default when using openssl based SSL provider (#11242)
• Additional commits viewable in compare view

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