CVE-2021-37137

The Snappy frame decoder function doesn't restrict the chunk length which may lead to excessive memory usage. Beside this it also may buffer reserved skippable chunks until the whole chunk was received which may lead to excessive memory usage as well. This vulnerability can be triggered by supplying malicious input that decompresses to a very big size (via a network stream or a file) or by sending a huge skippable chunk.

Impact

The Snappy frame decoder function doesn't restrict the chunk length which may lead to excessive memory usage. Beside this it also may buffer reserved skippable chunks until the whole chunk was received which may lead to excessive memory usage as well.

This vulnerability can be triggered by supplying malicious input that decompresses to a very big size (via a network stream or a file) or by sending a huge skippable chunk.

Impact

All users of SnappyFrameDecoder are affected and so the application may be in risk for a DoS attach due excessive memory usage.

References

https://github.com/netty/netty/blob/netty-4.1.67.Final/codec/src/main/java/io/netty/handler/codec/compression/SnappyFrameDecoder.java#L79 https://github.com/netty/netty/blob/netty-4.1.67.Final/codec/src/main/java/io/netty/handler/codec/compression/SnappyFrameDecoder.java#L171 https://github.com/netty/netty/blob/netty-4.1.67.Final/codec/src/main/java/io/netty/handler/codec/compression/SnappyFrameDecoder.java#L185

A client might overload the server by issue frequent RST frames. This can cause a massive amount of load on the remote system and so cause a DDOS attack.

Impact

This is a DDOS attack, any http2 server is affected and so you should update as soon as possible.

Patches

This is patched in version 4.1.100.Final.

Workarounds

A user can limit the amount of RST frames that are accepted per connection over a timeframe manually using either an own Http2FrameListener implementation or an ChannelInboundHandler implementation (depending which http2 API is used).

References

• https://www.cve.org/CVERecord?id=CVE-2023-44487
• https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/
• https://cloud.google.com/blog/products/identity-security/google-cloud-mitigated-largest-ddos-attack-peaking-above-398-million-rps/

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. %package help Summary: Documents for Buildarch: noarch Requires: man info Provides: -javadoc = - Obsoletes: -javadoc < - %description help Man pages and other related documents for .

Security Fix(es):

The Snappy frame decoder function doesn't restrict the chunk length which may lead to excessive memory usage. Beside this it also may buffer reserved skippable chunks until the whole chunk was received which may lead to excessive memory usage as well. This vulnerability can be triggered by supplying malicious input that decompresses to a very big size (via a network stream or a file) or by sending a huge skippable chunk.(CVE-2021-37137)

The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocation size used during decompression). All users of Bzip2Decoder are affected. The malicious input can trigger an OOME and so a DoS attack(CVE-2021-37136)

Root has patched GHSA-xpw8-rcwv-8f8p in the io.root.io.netty:netty-codec-http2 package for Root:Maven. Multiple fixed versions available.

The Snappy frame decoder function doesn't restrict the chunk length which may lead to excessive memory usage. Beside this it also may buffer reserved skippable chunks until the whole chunk was received which may lead to excessive memory usage as well. This vulnerability can be triggered by supplying malicious input that decompresses to a very big size (via a network stream or a file) or by sending a huge skippable chunk.

TuxCare rebuilt 43 io.netty packages to address 12 CVEs. Fixed in 4.1.63.Final-tuxcare.2.

TuxCare rebuilt 40 io.netty packages to address 16 CVEs. Fixed in 4.1.52.Final-tuxcare.1.

TuxCare rebuilt 40 io.netty packages to address 5 CVEs. Fixed in 4.1.48.Final-tuxcare.1.

TuxCare rebuilt 40 io.netty packages to address 9 CVEs. Fixed in 4.1.49.Final-tuxcare.1.

TuxCare rebuilt 6 io.netty packages to address 9 CVEs. Fixed in 4.1.58.Final-tuxcare.1.

TuxCare rebuilt 43 io.netty packages to address 15 CVEs. Fixed in 4.1.60.Final-tuxcare.1.

TuxCare rebuilt 3 io.netty packages to address 4 CVEs. Fixed in 4.1.43.Final-tuxcare.1.

TuxCare rebuilt 6 io.netty packages to address 13 CVEs. Fixed in 4.1.42.Final-tuxcare.1.

TuxCare rebuilt 40 io.netty packages to address 26 CVEs. Fixed in 4.1.53.Final-tuxcare.1.

TuxCare rebuilt 6 io.netty packages to address 11 CVEs. Fixed in 4.1.39.Final-tuxcare.1.

TuxCare rebuilt 11 io.netty packages to address 21 CVEs. Fixed in 4.1.51.Final-tuxcare.1.

TuxCare rebuilt 4 io.netty packages to address 6 CVEs. Fixed in 4.1.24.Final-tuxcare.1.

TuxCare rebuilt 4 io.netty packages to address 6 CVEs. Fixed in 4.1.29.Final-tuxcare.1.

TuxCare rebuilt 7 io.netty packages to address 10 CVEs. Fixed in 4.1.21.Final-tuxcare.1.

TuxCare rebuilt 3 io.netty packages to address 4 CVEs. Fixed in 4.0.56.Final-tuxcare.1.

TuxCare rebuilt 6 io.netty packages to address 7 CVEs. Fixed in 4.1.31.Final-tuxcare.1.

TuxCare rebuilt 6 io.netty packages to address 8 CVEs. Fixed in 4.1.38.Final-tuxcare.1.

TuxCare rebuilt 6 io.netty packages to address 7 CVEs. Fixed in 4.1.23.Final-tuxcare.1.

TuxCare rebuilt 14 io.netty packages to address 32 CVEs. Fixed in 4.1.64.Final-tuxcare.1.

These are all security issues fixed in the netty-4.1.114-1.1 package on the GA media of openSUSE Tumbleweed.

Rocky Enterprise Software Foundation Satellite is a systems management tool for Linux-based infrastructure. It allows for provisioning, remote management, and monitoring of multiple Linux deployments with a single centralized tool.

Security Fix(es):

• netty-codec: Bzip2Decoder doesn't allow setting size restrictions for decompressed data (CVE-2021-37136)
• netty-codec: SnappyFrameDecoder doesn't restrict chunk length and may buffer skippable chunks in an unnecessary way (CVE-2021-37137)
• python3-django: Possible XSS via template tag (CVE-2022-22818)
• tfm-rubygem-nokogiri: ReDoS in HTML encoding detection (CVE-2022-24836)
• tfm-rubygem-sinatra: Path traversal possible outside of public_dir when serving static files (CVE-2022-29970)
• tfm-rubygem-git: Package vulnerable to Command Injection via git argument injection (CVE-2022-25648)
• rubygem-rails-html-sanitizer: Possible XSS with certain configurations (CVE-2022-32209)
• python3-django: Potential SQL injection via Trunc and Extract arguments (CVE-2022-34265)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

The items above are not a complete list of changes. This update also fixes several bugs and adds various enhancements. Documentation for these changes is available from the Release Notes document.

This update for netty fixes the following issues:

• Updated to version 4.1.75:
  • CVE-2021-37136: Fixed an unrestricted decompressed data size in Bzip2Decoder (bsc#1190610).
  • CVE-2021-37137: Fixed an unrestricted chunk length in SnappyFrameDecoder, which might lead to excessive memory usage (#bsc#1190613).
  • CVE-2021-43797: Fixed a potential HTTP request smuggling issue due to insufficient validation against control characters (bsc#1193672).
  • CVE-2021-21290: Fixed an information disclosure via the local system temporary directory (bsc#1182103).

This update for netty fixes the following issues:

• CVE-2020-11612: The ZlibDecoders allow for unbounded memory allocation while decoding a byte stream (bsc#1168932)
• CVE-2021-21290: Information disclosure via the local system temporary directory (bsc#1182103)
• CVE-2021-37136: Bzip2Decoder doesn't allow setting size restrictions for decompressed data (bsc#1190610)
• CVE-2021-37137: Snappy frame decoder doesn't restrict the chunk length and may buffer skippable chunks (bsc#1190613)

This update for netty fixes the following issues:

• CVE-2020-11612: The ZlibDecoders allow for unbounded memory allocation while decoding a byte stream (bsc#1168932)
• CVE-2021-21290: Information disclosure via the local system temporary directory (bsc#1182103)
• CVE-2021-37136: Bzip2Decoder doesn't allow setting size restrictions for decompressed data (bsc#1190610)
• CVE-2021-37137: Snappy frame decoder doesn't restrict the chunk length and may buffer skippable chunks (bsc#1190613)

This update for netty fixes the following issues:

• CVE-2020-11612: The ZlibDecoders allow for unbounded memory allocation while decoding a byte stream (bsc#1168932)
• CVE-2021-21290: Information disclosure via the local system temporary directory (bsc#1182103)
• CVE-2021-37136: Bzip2Decoder doesn't allow setting size restrictions for decompressed data (bsc#1190610)
• CVE-2021-37137: Snappy frame decoder doesn't restrict the chunk length and may buffer skippable chunks (bsc#1190613)

It was discovered that Netty's Zlib decoders did not limit memory allocations. A remote attacker could possibly use this issue to cause Netty to exhaust memory via malicious input, leading to a denial of service. This issue only affected Ubuntu 16.04 ESM and Ubuntu 20.04 ESM. (CVE-2020-11612)

It was discovered that Netty created temporary files with excessive permissions. A local attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM, and Ubuntu 20.04 ESM. (CVE-2021-21290)

It was discovered that Netty did not properly validate content-length headers. A remote attacker could possibly use this issue to smuggle requests. This issue was only fixed in Ubuntu 20.04 ESM. (CVE-2021-21295, CVE-2021-21409)

It was discovered that Netty's Bzip2 decompression decoder did not limit the decompressed output data size. A remote attacker could possibly use this issue to cause Netty to exhaust memory via malicious input, leading to a denial of service. This issue only affected Ubuntu 18.04 ESM, Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2021-37136)

It was discovered that Netty's Snappy frame decoder function did not limit chunk lengths. A remote attacker could possibly use this issue to cause Netty to exhaust memory via malicious input, leading to a denial of service. (CVE-2021-37137)

It was discovered that Netty did not properly handle control chars at the beginning and end of header names. A remote attacker could possibly use this issue to smuggle requests. This issue only affected Ubuntu 18.04 ESM, Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2021-43797)

It was discovered that Netty could be made into an infinite recursion when parsing a malformed crafted message. A remote attacker could possibly use this issue to cause Netty to crash, leading to a denial of service. This issue only affected Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2022-41881)

It was discovered that Netty did not validate header values under certain circumstances. A remote attacker could possibly use this issue to perform HTTP response splitting via malicious header values. This issue only affected Ubuntu 18.04 ESM, Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2022-41915)