diff options
Diffstat (limited to 'poky/meta/recipes-core/coreutils/coreutils/CVE-2017-18018-2.patch')
| -rw-r--r-- | poky/meta/recipes-core/coreutils/coreutils/CVE-2017-18018-2.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/poky/meta/recipes-core/coreutils/coreutils/CVE-2017-18018-2.patch b/poky/meta/recipes-core/coreutils/coreutils/CVE-2017-18018-2.patch new file mode 100644 index 000000000..c8f5f54ac --- /dev/null +++ b/poky/meta/recipes-core/coreutils/coreutils/CVE-2017-18018-2.patch @@ -0,0 +1,83 @@ +From bc2fd9796403e03bb757b064d44c22fab92e6842 Mon Sep 17 00:00:00 2001 +From: Michael Orlitzky <michael@orlitzky.com> +Date: Thu, 4 Jan 2018 11:38:21 -0500 +Subject: doc: warn about following symlinks recursively in chown/chgrp + +In both chown and chgrp (which shares its code with chown), operating +on symlinks recursively has a window of vulnerability where the +destination user or group can change the target of the operation. +Warn about combining the --dereference, --recursive, and -L flags. + +* doc/coreutils.texi (warnOptDerefWithRec): Add macro. +(node chown invocation): Add it to --dereference and -L. +(node chgrp invocation): Likewise. + +See also: CVE-2017-18018 +CVE: CVE-2017-18018 +Upstream-Status: Backport from v8.30 + +Signed-off-by: Michael Orlitzky <michael@orlitzky.com> +Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com> +--- + doc/coreutils.texi | 17 +++++++++++++++++ + 1 file changed, 17 insertions(+) + +diff --git a/doc/coreutils.texi b/doc/coreutils.texi +index 6bb9f09..9f5f95b 100644 +--- a/doc/coreutils.texi ++++ b/doc/coreutils.texi +@@ -1428,6 +1428,19 @@ a command line argument is a symbolic link to a directory, traverse it. + In a recursive traversal, traverse every symbolic link to a directory + that is encountered. + @end macro ++ ++@c Append the following warning to -L where appropriate (e.g. chown). ++@macro warnOptDerefWithRec ++ ++Combining this dereferencing option with the @option{--recursive} option ++may create a security risk: ++During the traversal of the directory tree, an attacker may be able to ++introduce a symlink to an arbitrary target; when the tool reaches that, ++the operation will be performed on the target of that symlink, ++possibly allowing the attacker to escalate privileges. ++ ++@end macro ++ + @choptL + + @macro choptP +@@ -10995,6 +11008,7 @@ chown -h -R --from=OLDUSER NEWUSER / + @findex lchown + Do not act on symbolic links themselves but rather on what they point to. + This is the default when not operating recursively. ++@warnOptDerefWithRec + + @item -h + @itemx --no-dereference +@@ -11051,6 +11065,7 @@ Recursively change ownership of directories and their contents. + @xref{Traversing symlinks}. + + @choptL ++@warnOptDerefWithRec + @xref{Traversing symlinks}. + + @choptP +@@ -11125,6 +11140,7 @@ changed. + @findex lchown + Do not act on symbolic links themselves but rather on what they point to. + This is the default when not operating recursively. ++@warnOptDerefWithRec + + @item -h + @itemx --no-dereference +@@ -11180,6 +11196,7 @@ Recursively change the group ownership of directories and their contents. + @xref{Traversing symlinks}. + + @choptL ++@warnOptDerefWithRec + @xref{Traversing symlinks}. + + @choptP +-- +cgit v1.0-41-gc330 + |