diff --git a/ruby.spec b/ruby.spec index e2ed26e..2abdfbf 100644 --- a/ruby.spec +++ b/ruby.spec @@ -354,6 +354,12 @@ Patch81: rubygem-erb-4.0.3.1-Fix-arbitrary-code-execution-via-deserialization-by # https://github.com/ruby/net-imap/commit/d16e994 # https://github.com/ruby/net-imap/commit/6b2fda5 Patch82: rubygem-net-imap-0.3.10-Fix-Information-disclosure-via-man-in-the-middle-attack-bypassing-TLS-CVE-2026-42246.patch +# Fix CVE-2026-42258 IMAP Command Injection via Symbol Arguments. +# https://github.com/ruby/net-imap/commit/1eb27278a601be1135910dae6ab6e517559a2e4a +# https://github.com/ruby/net-imap/commit/bbd9eb7ecca506fa43b656368f7aebef8ac09182 +# Additionally, backport validation regex ATOM_SPECIALS that's needed, from +# https://github.com/ruby/net-imap/commit/92db350b24c388d2a2104f36cac9caa49a1044df +Patch83: rubygem-net-imap-0.4.24-Fix-IMAP-Command-Injection-via-Symbol-Arguments-CVE-2026-42258.patch Requires: %{name}-libs%{?_isa} = %{version}-%{release} Suggests: rubypick @@ -838,6 +844,7 @@ rm -rf ext/fiddle/libffi* %patch80 -p1 %patch81 -p1 %patch82 -p1 +%patch83 -p1 # Instead of adjusting patch's directory, use the following form where # we first enter the correct directory, this allows more general application @@ -1624,6 +1631,8 @@ make runruby TESTRUN_SCRIPT=" \ - Fix information disclosure via MITM attack bypassing TLS in net-imap. (CVE-2026-42246) Resolves: RHEL-181777 +- Fix command injection via Symbol arguments in net-imap. (CVE-2026-42258) + Resolves: RHEL-181808 * Mon Apr 27 2026 Jarek Prokop - 3.0.7-166 - Fix arbitrary code execution via deserialization bypass in ERB. (CVE-2026-41316) diff --git a/rubygem-net-imap-0.4.24-Fix-IMAP-Command-Injection-via-Symbol-Arguments-CVE-2026-42258.patch b/rubygem-net-imap-0.4.24-Fix-IMAP-Command-Injection-via-Symbol-Arguments-CVE-2026-42258.patch new file mode 100644 index 0000000..d76759d --- /dev/null +++ b/rubygem-net-imap-0.4.24-Fix-IMAP-Command-Injection-via-Symbol-Arguments-CVE-2026-42258.patch @@ -0,0 +1,241 @@ +From ec11376b38dbfbd1dde52d3410def338c7656170 Mon Sep 17 00:00:00 2001 +From: nick evans +Date: Wed, 22 Apr 2026 11:25:06 -0400 +Subject: [PATCH 1/3] =?UTF-8?q?=F0=9F=8D=92=20edit=20ca72ac45:=20=E2=99=BB?= + =?UTF-8?q?=EF=B8=8F=20Extract=20superclass=20for=20(internal)=20command?= + =?UTF-8?q?=20data?= +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Unlike the cherry-picked commit (ca72ac45), this _only_ makes +`CommandData` the superclass for `Literal` and `Atom`. Because those +are the classes that will be modified by later cherry-picked commits. +This allows those other commits to merge more cleanly, and work with +fewer modifications. +--- + lib/net/imap.rb | 50 +++++++++++++++++++++++++------------------------ + 1 file changed, 26 insertions(+), 24 deletions(-) + +diff --git a/lib/net/imap.rb b/lib/net/imap.rb +index 1a2afc0ea7..92ff9a0fbe 100644 +--- a/lib/net/imap.rb ++++ b/lib/net/imap.rb +@@ -1571,33 +1571,44 @@ def start_tls_session(params = {}) + end + end + +- class RawData # :nodoc: +- def send_data(imap, tag) +- imap.__send__(:put_string, @data) ++ # simplistic emulation of CommandData = Data.define(:data) ++ class CommandData # :nodoc: ++ class << self ++ def new(arg = nil, data: arg) super(data: data) end ++ alias :[] :new + end + +- def validate ++ def initialize(data:) ++ @data = data ++ freeze + end + +- private ++ attr_reader :data + +- def initialize(data) +- @data = data +- end +- end ++ def to_h(&block) block ? to_h.to_h(&block) : { data: data } end ++ def ==(other) self.class === other && to_h == other.to_h end ++ def eql?(other) self.class === other && to_h.eql?(other.to_h) end ++ ++ # following class definition goes beyond the basic Data.define(:data) ++ ## + +- class Atom # :nodoc: + def send_data(imap, tag) +- imap.__send__(:put_string, @data) ++ raise NoMethodError, "#{self.class} must implement #{__method__}" + end + + def validate + end ++ end + +- private ++ class RawData < CommandData # :nodoc: ++ def send_data(imap, tag) ++ imap.__send__(:put_string, @data) ++ end ++ end + +- def initialize(data) +- @data = data ++ class Atom < CommandData # :nodoc: ++ def send_data(imap, tag) ++ imap.__send__(:put_string, @data) + end + end + +@@ -1616,19 +1627,10 @@ def initialize(data) + end + end + +- class Literal # :nodoc: ++ class Literal < CommandData # :nodoc: + def send_data(imap, tag) + imap.__send__(:send_literal, @data, tag) + end +- +- def validate +- end +- +- private +- +- def initialize(data) +- @data = data +- end + end + + class MessageSet # :nodoc: + +From f793ce76e5f417c011a437418feb8378039e4a37 Mon Sep 17 00:00:00 2001 +From: nick evans +Date: Thu, 19 Feb 2026 15:06:08 -0500 +Subject: [PATCH 2/3] =?UTF-8?q?=F0=9F=8D=92=20pick=209db3e9d60:=20?= + =?UTF-8?q?=F0=9F=A5=85=20Strictly=20validate=20symbol=20(\flag)=20argumen?= + =?UTF-8?q?ts=20[backports=20#657]?= +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Flags should not allow `atom-specials`. + +Previously, no validation was done on symbol data. Sending atom or flag +args which contain atom specials could lead to various errors. + +Although this could theoretically include injection attacks, this is not +considered to be a critical vulnerability in `net-imap`, for the +following reason: Valid "system flag" inputs are restricted to an +enumerated set of RFC-defined flag types. User-defined "keyword" flags +are sent as atoms, not flags, which use string inputs (strings which +can't be sent as an atom will be quoted or sent as a literal). `\Seen` +as a flag (symbol argument) is semantically different from `Seen` as a +keyword (string argument). So there is no scenario where it is +appropriate to call `#to_sym` on unvetted user input. Any code which +calls `#to_sym` indiscriminately on user-input is already buggy. + +Nevertheless, users should reasonably be able to rely on `net-imap` to +do very basic input validation on its basic input types. +--- + lib/net/imap.rb | 33 +++++++++++++++++++++++++++------ + 1 file changed, 27 insertions(+), 6 deletions(-) + +diff --git a/lib/net/imap.rb b/lib/net/imap.rb +index 92ff9a0fbe..5dc0638e2f 100644 +--- a/lib/net/imap.rb ++++ b/lib/net/imap.rb +@@ -1349,6 +1349,7 @@ def validate_data(data) + end + when Time + when Symbol ++ Flag.validate(data) + else + data.validate + end +@@ -1367,7 +1368,7 @@ def send_data(data, tag = nil) + when Time + send_time_data(data) + when Symbol +- send_symbol_data(data) ++ Flag[data].send_data(self, tag) + else + data.send_data(self, tag) + end +@@ -1437,10 +1438,6 @@ def send_time_data(time) + put_string(s) + end + +- def send_symbol_data(symbol) +- put_string("\\" + symbol.to_s) +- end +- + def search_internal(cmd, keys, charset) + if keys.instance_of?(String) + keys = [RawData.new(keys)] +@@ -1592,6 +1589,12 @@ def eql?(other) self.class === other && to_h.eql?(other.to_h) end + # following class definition goes beyond the basic Data.define(:data) + ## + ++ def self.validate(...) ++ data = new(...) ++ data.validate ++ data ++ end ++ + def send_data(imap, tag) + raise NoMethodError, "#{self.class} must implement #{__method__}" + end +@@ -1607,8 +1610,26 @@ def send_data(imap, tag) + end + + class Atom < CommandData # :nodoc: ++ def initialize(**) ++ super ++ validate ++ end ++ ++ def validate ++ data.to_s.ascii_only? \ ++ or raise DataFormatError, "#{self.class} must be ASCII only" ++ data.match?(ResponseParser::Patterns::ATOM_SPECIALS) \ ++ and raise DataFormatError, "#{self.class} must not contain atom-specials" ++ end ++ + def send_data(imap, tag) +- imap.__send__(:put_string, @data) ++ imap.__send__(:put_string, data.to_s) ++ end ++ end ++ ++ class Flag < Atom # :nodoc: ++ def send_data(imap, tag) ++ imap.__send__(:put_string, "\\#{data}") + end + end + + +From e407aa69f28b71f20eb83145be14ff8a2e57436f Mon Sep 17 00:00:00 2001 +From: Jarek Prokop +Date: Tue, 9 Jun 2026 18:14:51 +0200 +Subject: [PATCH 3/3] Cherry-pick ATOM_SPECIALS for validation regex. + +The previous commit relies on ResponseParsers::Patterns::ATOM_SPECIALS +to be available. We could either hardcode the regex in the line where +the matching happens, but instead have it live in its own constant for +easier reference and less edits to the actual commit backport. + +The line ported from: +https://github.com/ruby/net-imap/commit/92db350b24c388d2a2104f36cac9caa49a1044df +--- + lib/net/imap.rb | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/lib/net/imap.rb b/lib/net/imap.rb +index 5dc0638e2f..07af17c008 100644 +--- a/lib/net/imap.rb ++++ b/lib/net/imap.rb +@@ -2222,6 +2222,10 @@ def multipart? + end + + class ResponseParser # :nodoc: ++ module Patterns ++ ATOM_SPECIALS = /[(){ \x00-\x1f\x7f%*"\\\]]/n ++ end ++ + def initialize + @str = nil + @pos = nil