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| author | dana <dana@dana.is> | 2021-12-21 13:13:33 -0600 |
|---|---|---|
| committer | dana <dana@dana.is> | 2022-02-12 07:22:11 -0600 |
| commit | bdc4d70a7e033b754e68a8659a037ea0fc5f38de (patch) | |
| tree | 67db649c8f168ec5de967e06474f51c28c3889f0 | |
| parent | fdb8b0ce6244ff26bf55e0fd825310a58d0d3156 (diff) | |
| download | zsh-bdc4d70a7e033b754e68a8659a037ea0fc5f38de.tar.gz zsh-bdc4d70a7e033b754e68a8659a037ea0fc5f38de.tar.xz zsh-bdc4d70a7e033b754e68a8659a037ea0fc5f38de.zip | |
CVE-2021-45444: Update NEWS/README
| -rw-r--r-- | ChangeLog | 2 | ||||
| -rw-r--r-- | NEWS | 20 | ||||
| -rw-r--r-- | README | 6 |
3 files changed, 28 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 678d46fca..bb46493a5 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,7 @@ 2022-01-27 dana <dana@dana.is> + * CVE-2021-45444: NEWS, README: Document preceding two changes + * Marc Cornellà: security/89: Etc/CVE-2021-45444-VCS_Info-workaround.patch: Add patch which can optionally be used to work around recursive PROMPT_SUBST diff --git a/NEWS b/NEWS index 964e1633f..327b449a0 100644 --- a/NEWS +++ b/NEWS @@ -4,6 +4,26 @@ CHANGES FROM PREVIOUS VERSIONS OF ZSH 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>. ] + Changes since 5.7.1-test-3 -------------------------- diff --git a/README b/README index 7f1dd5f92..c9e994ab3 100644 --- a/README +++ b/README @@ -31,6 +31,12 @@ Zsh is a shell with lots of features. For a list of some of these, see the file FEATURES, and for the latest changes see NEWS. For more details, see the documentation. +Incompatibilities since 5.8 +--------------------------- + +PROMPT_SUBST expansion is no longer performed on arguments to prompt- +expansion sequences such as %F. + Incompatibilities since 5.7.1 ----------------------------- |