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Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/NEWS b/NEWS index 3459391e7..1e9926c05 100644 --- a/NEWS +++ b/NEWS @@ -7,6 +7,23 @@ Note also the list of incompatibilities in the README file. Changes since 5.8 ----------------- +CVE-2021-45444: Some prompt expansion sequences, such as %F, support +'arguments' which are themselves expanded in case they contain colour +values, etc. This additional expansion would trigger PROMPT_SUBST +evaluation, if enabled. This could be abused to execute code the user +didn't expect. e.g., given a certain prompt configuration, an attacker +could trick a user into executing arbitrary code by having them check +out a Git branch with a specially crafted name. + +This is fixed in the shell itself by no longer performing PROMPT_SUBST +evaluation on these prompt-expansion arguments. + +Users who are concerned about an exploit but unable to update their +binaries may apply the partial work-around described in the file +Etc/CVE-2021-45444-VCS_Info-workaround.patch included with the shell +source. [ Reported by RyotaK <security@ryotak.me>. Additional thanks to +Marc Cornellà <hello@mcornella.com>. ] + When unsetting a hash element, the string enclosed in square brackets is interpreted literally after any normal command-line-argument expansions. Thus |