CVE-2018-1083

Zsh before version 5.4.2-test-1 is vulnerable to a buffer overflow in the shell autocomplete functionality. A local unprivileged user can create a specially crafted directory path which leads to code execution in the context of the user who tries to use autocomplete to traverse the before mentioned path. If the user affected is privileged, this leads to privilege escalation.

Zsh before version 5.4.2-test-1 is vulnerable to a buffer overflow in the shell autocomplete functionality. A local unprivileged user can create a specially crafted directory path which leads to code execution in the context of the user who tries to use autocomplete to traverse the before mentioned path. If the user affected is privileged, this leads to privilege escalation.

Richard Maciel Costa discovered that Zsh incorrectly handled certain inputs. An attacker could possibly use this to cause a denial of service (CVE-2018-1071).

It was discovered that Zsh incorrectly handled certain files. An attacker could possibly use this to execute arbitrary code (CVE-2018-1083).

These are all security issues fixed in the zsh-5.8-7.7 package on the GA media of openSUSE Tumbleweed.

This update for zsh fixes the following issues:

• CVE-2014-10070: environment variable injection could lead to local privilege escalation (bnc#1082885)

• CVE-2014-10071: buffer overflow in exec.c could lead to denial of service. (bnc#1082977)

• CVE-2014-10072: buffer overflow In utils.c when scanning very long directory paths for symbolic links. (bnc#1082975)

• CVE-2016-10714: In zsh before 5.3, an off-by-one error resulted in undersized buffers that were intended to support PATH_MAX characters. (bnc#1083250)

• CVE-2017-18205: In builtin.c when sh compatibility mode is used, a NULL pointer dereference could lead to denial of service (bnc#1082998)

• CVE-2018-1071: exec.c:hashcmd() function vulnerability could lead to denial of service. (bnc#1084656)

• CVE-2018-1083: Autocomplete vulnerability could lead to privilege escalation. (bnc#1087026)

• CVE-2018-7549: In params.c in zsh through 5.4.2, there is a crash during a copy of an empty hash table, as demonstrated by typeset -p. (bnc#1082991)

• CVE-2017-18206: buffer overrun in xsymlinks could lead to denial of service (bnc#1083002)

• Autocomplete and REPORTTIME broken (bsc#896914)

This update for zsh to version 5.5 fixes the following issues:

Security issues fixed:

• CVE-2018-1100: Fixes a buffer overflow in utils.c:checkmailpath() that can lead to local arbitrary code execution (bsc#1089030)
• CVE-2018-1071: Fixed a stack-based buffer overflow in exec.c:hashcmd() (bsc#1084656)
• CVE-2018-1083: Fixed a stack-based buffer overflow in gen_matches_files() at compctl.c (bsc#1087026)

Non-security issues fixed:

• The effect of the NO_INTERACTIVE_COMMENTS option extends into $(...) and ... command substitutions when used on the command line.
• The 'exec' and 'command' precommand modifiers, and options to them, are now parsed after parameter expansion.
• Functions executed by ZLE widgets no longer have their standard input closed, but redirected from /dev/null instead.
• There is an option WARN_NESTED_VAR, a companion to the existing WARN_CREATE_GLOBAL that causes a warning if a function updates a variable from an enclosing scope without using typeset -g.
• zmodload now has an option -s to be silent on a failure to find a module but still print other errors.

This update for zsh fixes the following issues:

• CVE-2019-20044: Fixed an insecure dropping of privileges when unsetting the PRIVILEGED option (bsc#1163882).
• CVE-2018-13259: Fixed an unexpected truncation of long shebang lines (bsc#1107294).
• CVE-2018-7549: Fixed a crash when an empty hash table (bsc#1082991).
• CVE-2018-1083: Fixed a stack-based buffer overflow when using tab completion on directories with long names (bsc#1087026).
• CVE-2018-1071: Fixed a stack-based buffer overflow when executing certain commands (bsc#1084656).
• CVE-2018-0502: Fixed a mishandling of shebang lines (bsc#1107296).
• CVE-2017-18206: Fixed a buffer overflow related to symlink processing (bsc#1083002).
• CVE-2017-18205: Fixed an application crash when using cd with no arguments (bsc#1082998).
• CVE-2016-10714: Fixed a potential application crash when handling maximum length paths (bsc#1083250).
• CVE-2014-10072: Fixed a buffer overflow when scanning very long directory paths for symbolic links (bsc#1082975).
• CVE-2014-10071: Fixed a buffer overflow when redirecting output to a long file descriptor (bsc#1082977).
• CVE-2014-10070: Fixed a privilege escalation vulnerability via environment variables (bsc#1082885).

Richard Maciel Costa discovered that Zsh incorrectly handled certain inputs. An attacker could possibly use this to cause a denial of service. (CVE-2018-1071)

It was discovered that Zsh incorrectly handled certain files. An attacker could possibly use this to execute arbitrary code. (CVE-2018-1083)