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

• 97d0448 [maven-release-plugin] prepare release netty-4.1.59.Final
• c735357 Use Files.createTempFile(...) to ensure the file is created with proper permi...
• 8f397e2 Update to latest os-maven-plugin (#11003)
• c9a8d1d Fix test reports name
• 73286d5 Publish test results after PR run (#11002)
• d943d11 DecodeHexBenchmark is too branch-predictor friendly (#9942)
• d0bcf44 Fix memory release failure when "maxNumElems == 1" of PoolSubpage (#10988)
• 5460ae7 Bump ant from 1.9.15 to 1.10.9 (#10990)
• 6ce1541 Revert HttpPostMultipartRequestDecoder and HttpPostStandardRequestDecoder to ...
• ab8b8ae Introduce SslContextOption which can be used for "optional" features … (#10981)
• Additional commits viewable in compare view

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

• 97d0448 [maven-release-plugin] prepare release netty-4.1.59.Final
• c735357 Use Files.createTempFile(...) to ensure the file is created with proper permi...
• 8f397e2 Update to latest os-maven-plugin (#11003)
• c9a8d1d Fix test reports name
• 73286d5 Publish test results after PR run (#11002)
• d943d11 DecodeHexBenchmark is too branch-predictor friendly (#9942)
• d0bcf44 Fix memory release failure when "maxNumElems == 1" of PoolSubpage (#10988)
• 5460ae7 Bump ant from 1.9.15 to 1.10.9 (#10990)
• 6ce1541 Revert HttpPostMultipartRequestDecoder and HttpPostStandardRequestDecoder to ...
• ab8b8ae Introduce SslContextOption which can be used for "optional" features … (#10981)
• Additional commits viewable in compare view

• 97d0448 [maven-release-plugin] prepare release netty-4.1.59.Final
• c735357 Use Files.createTempFile(...) to ensure the file is created with proper permi...
• 8f397e2 Update to latest os-maven-plugin (#11003)
• c9a8d1d Fix test reports name
• 73286d5 Publish test results after PR run (#11002)
• d943d11 DecodeHexBenchmark is too branch-predictor friendly (#9942)
• d0bcf44 Fix memory release failure when "maxNumElems == 1" of PoolSubpage (#10988)
• 5460ae7 Bump ant from 1.9.15 to 1.10.9 (#10990)
• 6ce1541 Revert HttpPostMultipartRequestDecoder and HttpPostStandardRequestDecoder to ...
• ab8b8ae Introduce SslContextOption which can be used for "optional" features … (#10981)
• Additional commits viewable in compare view

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