CVE-2018-1071

zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the exec.c:hashcmd() function. A local attacker could exploit this to cause a denial of service.

zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the exec.c:hashcmd() function. A local attacker could exploit this to cause a denial of service.

• CVE-2018-1071: check bounds when copying path in hashcmd()
• CVE-2018-7549: avoid crash copying empty hash table
• CVE-2018-13259: fix shebang line truncation in zexecve()

• CVE-2018-1071: check bounds when copying path in hashcmd()
• CVE-2018-7549: avoid crash copying empty hash table
• CVE-2018-13259: fix shebang line truncation in zexecve()

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)