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Fix git-info arbitrary command execution exposure

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The contents of git_info are subject to expansion by the shell. Avoid
putting raw ref names in the prompt to protect the user from arbitrary
code execution via specially crafted ref names (e.g., a ref named
'$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)' would execute 'sudo rm -rf /' when the
prompt is drawn). Instead, put the ref names in new global variables and
reference these variables from git_info.

See:
- https://github.com/njhartwell/pw3nage
- 8976500cbb

Fixes #158, Closes #159
This commit is contained in:
Eric Nielsen 2017-03-30 10:01:10 -05:00 committed by Matt Hamilton
parent f3e673a52b
commit 53a3cd7933
1 changed files with 24 additions and 9 deletions
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33
modules/git-info/init.zsh
View file

@ -125,8 +125,16 @@ git-info() {
fi
fi
# The contents of git_info are subject to expansion by the shell. Avoid
# putting raw ref names in the prompt to protect the user from arbitrary code
# execution via specially crafted ref names (e.g., a ref named
# '$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)' would execute 'sudo rm -rf /' when the
# prompt is drawn). Instead, put the ref names in new global variables and
# reference these variables from git_info.
# See https://github.com/njhartwell/pw3nage
# Get the branch.
local branch=$(git symbolic-ref -q --short HEAD 2>/dev/null)
__GIT_INFO_BRANCH=$(git symbolic-ref -q --short HEAD 2>/dev/null)
local ahead_formatted
local behind_formatted
@ -135,12 +143,14 @@ git-info() {
local diverged_formatted
local position_formatted
local remote_formatted
if [[ -n ${branch} ]]; then
if [[ -n ${__GIT_INFO_BRANCH} ]]; then
unset __GIT_INFO_POSITION
# Format branch.
local branch_format
zstyle -s ':zim:git-info:branch' format 'branch_format'
if [[ -n ${branch_format} ]]; then
zformat -f branch_formatted ${branch_format} "b:${branch}"
zformat -f branch_formatted ${branch_format} 'b:${__GIT_INFO_BRANCH}'
fi
# Format remote.
@ -149,9 +159,11 @@ git-info() {
if [[ -n ${remote_format} ]]; then
# Gets the remote name.
local remote_cmd='git rev-parse --symbolic-full-name --verify HEAD@{upstream}'
local remote=${$(${(z)remote_cmd} 2>/dev/null)##refs/remotes/}
if [[ -n ${remote} ]]; then
zformat -f remote_formatted ${remote_format} "R:${remote}"
__GIT_INFO_REMOTE=${$(${(z)remote_cmd} 2>/dev/null)##refs/remotes/}
if [[ -n ${__GIT_INFO_REMOTE} ]]; then
zformat -f remote_formatted ${remote_format} 'R:${__GIT_INFO_REMOTE}'
else
unset __GIT_INFO_REMOTE
fi
fi
@ -185,6 +197,9 @@ git-info() {
fi
fi
else
unset __GIT_INFO_BRANCH
unset __GIT_INFO_REMOTE
# Format commit.
local commit_format
zstyle -s ':zim:git-info:commit' format 'commit_format'
@ -199,9 +214,9 @@ git-info() {
local position_format
zstyle -s ':zim:git-info:position' format 'position_format'
if [[ -n ${position_format} ]]; then
local position=$(git describe --contains --all HEAD 2>/dev/null)
if [[ -n ${position} ]]; then
zformat -f position_formatted ${position_format} "p:${position}"
__GIT_INFO_POSITION=$(git describe --contains --all HEAD 2>/dev/null)
if [[ -n ${__GIT_INFO_POSITION} ]]; then
zformat -f position_formatted ${position_format} 'p:${__GIT_INFO_POSITION}'
fi
fi
fi