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CVE-2023-40175: Merge pull request from GHSA-68xg-gqqm-vgj8 · puma/puma@690155e

Puma is a Ruby/Rack web server built for parallelism. Prior to versions 6.3.1 and 5.6.7, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling. Severity of this issue is highly dependent on the nature of the web site using puma is. This could be caused by either incorrect parsing of trailing fields in chunked transfer encoding bodies or by parsing of blank/zero-length Content-Length headers. Both issues have been addressed and this vulnerability has been fixed in versions 6.3.1 and 5.6.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVE
#vulnerability#web#ruby

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@@ -49,7 +49,8 @@ class Client # :nodoc:

# chunked body validation

CHUNK_SIZE_INVALID = /[^\h]/.freeze

CHUNK_VALID_ENDING = "\r\n".freeze

CHUNK_VALID_ENDING = Const::LINE_END

CHUNK_VALID_ENDING_SIZE = CHUNK_VALID_ENDING.bytesize

# Content-Length header value validation

CONTENT_LENGTH_VALUE_INVALID = /[^\d]/.freeze

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@@ -382,8 +383,8 @@ def setup_body

cl = @env[CONTENT_LENGTH]

if cl

# cannot contain characters that are not \d

if CONTENT_LENGTH_VALUE_INVALID.match? cl

# cannot contain characters that are not \d, or be empty

if CONTENT_LENGTH_VALUE_INVALID.match?(cl) || cl.empty?

raise HttpParserError, “Invalid Content-Length: #{cl.inspect}”

end

else

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@@ -544,7 +545,7 @@ def decode_chunk(chunk)

while !io.eof?

line = io.gets

if line.end_with?(“\r\n”)

if line.end_with?(CHUNK_VALID_ENDING)

# Puma doesn’t process chunk extensions, but should parse if they’re

# present, which is the reason for the semicolon regex

chunk_hex = line.strip[/\A[^;]+/]

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@@ -556,13 +557,19 @@ def decode_chunk(chunk)

@in_last_chunk = true

@body.rewind

rest = io.read

last_crlf_size = "\r\n".bytesize

if rest.bytesize < last_crlf_size

if rest.bytesize < CHUNK_VALID_ENDING_SIZE

@buffer = nil

@partial_part_left = last_crlf_size - rest.bytesize

@partial_part_left = CHUNK_VALID_ENDING_SIZE - rest.bytesize

return false

else

@buffer = rest[last_crlf_size…-1]

# if the next character is a CRLF, set buffer to everything after that CRLF

start_of_rest = if rest.start_with?(CHUNK_VALID_ENDING)

CHUNK_VALID_ENDING_SIZE

else # we have started a trailer section, which we do not support. skip it!

rest.index(CHUNK_VALID_ENDING*2) + CHUNK_VALID_ENDING_SIZE*2

end

@buffer = rest[start_of_rest…-1]

@buffer = nil if @buffer.empty?

set_ready

return true

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Related news

Ubuntu Security Notice USN-6682-1

Ubuntu Security Notice 6682-1 - ZeddYu Lu discovered that Puma incorrectly handled parsing certain headers. A remote attacker could possibly use this issue to perform an HTTP Request Smuggling attack. This issue only affected Ubuntu 20.04 LTS. It was discovered that Puma incorrectly handled parsing certain headers. A remote attacker could possibly use this issue to perform an HTTP Request Smuggling attack. This issue only affected Ubuntu 20.04 LTS.

Red Hat Security Advisory 2024-0797-03

Red Hat Security Advisory 2024-0797-03 - Updated Satellite 6.14 packages that fixes Important security bugs and several regular bugs are now available for Red Hat Satellite. Issues addressed include HTTP request smuggling, buffer overflow, denial of service, and memory leak vulnerabilities.

Ubuntu Security Notice USN-6399-1

Ubuntu Security Notice 6399-1 - It was discovered that Puma incorrectly handled parsing certain headers. A remote attacker could possibly use this issue to perform an HTTP request Smuggling attack.

GHSA-68xg-gqqm-vgj8: Puma HTTP Request/Response Smuggling vulnerability

### Impact Prior to version 6.3.1, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling. The following vulnerabilities are addressed by this advisory: * Incorrect parsing of trailing fields in chunked transfer encoding bodies * Parsing of blank/zero-length Content-Length headers ### Patches The vulnerability has been fixed in 6.3.1 and 5.6.7. ### Workarounds No known workarounds. ### References [HTTP Request Smuggling](https://portswigger.net/web-security/request-smuggling) ### For more information If you have any questions or comments about this advisory: Open an issue in [Puma](https://github.com/puma/puma) See our [security policy](https://github.com/puma/puma/security/policy)

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