CVE-2016-9401

popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted address.

popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted address.

In Bash, the popd command can be tricked to free a user supplied address, which could be used to bypass restricted shells (rsh) on some environments to cause use-after-free (CVE-2016-9401).

These are all security issues fixed in the bash-4.4-92.1 package on the GA media of openSUSE Tumbleweed.

This update for bash fixes an issue that could lead to syntax errors when parsing scripts that use expr(1) inside loops.

Additionally, the popd build-in now ensures that the normalized stack offset is within bounds before trying to free that stack entry. This fixes a segmentation fault.

This update for bash fixed several issues

This security issue was fixed:

• CVE-2016-9401: popd in bash might allowed local users to bypass the restricted shell and cause a use-after-free via a crafted address (bsc#1010845).

This non-security issue was fixed:

• Fix when HISTSIZE=0 and chattr +a .bash_history (bsc#1031729)

Bernd Dietzel discovered that Bash incorrectly expanded the hostname when displaying the prompt. If a remote attacker were able to modify a hostname, this flaw could be exploited to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-0634)

It was discovered that Bash incorrectly handled the SHELLOPTS and PS4 environment variables. A local attacker could use this issue to execute arbitrary code with root privileges. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-7543)

It was discovered that Bash incorrectly handled the popd command. A remote attacker could possibly use this issue to bypass restricted shells. (CVE-2016-9401)

It was discovered that Bash incorrectly handled path autocompletion. A local attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 17.04. (CVE-2017-5932)