A flaw was found in the bash functionality that evaluates specially formatted environment variables passed to it from another environment. An attacker could use this feature to override or bypass restrictions to the environment to execute shell commands before restrictions have been applied. Certain services and applications allow remote unauthenticated attackers to provide environment variables, allowing them to exploit this issue.

Acknowledgements:

Red Hat would like to thank Stephane Chazelas for reporting this issue.

GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed function definitions in the values of environment variables, which allows remote attackers to write to files or possibly have unknown other impact via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the modcgi and modcgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-6271.

A flaw was found in the way qemu v1.3.0 and later (virtio-rng) validates addresses when guest accesses the config space of a virtio device. If the virtio device has zero/small sized config space, such as virtio-rng, a privileged guest user could use this flaw to access the matching host's qemu address space and thus increase their privileges on the host.

Remote Manager in Open Enterprise Server (OES) allows unauthenticated remote attackers to read any arbitrary file, via a specially crafted URL, that allows complete directory traversal and total information disclosure. This vulnerability is present on all versions of OES for linux, it applies to OES2015 SP1 before Maintenance Update 11080, OES2015 before Maintenance Update 11079, OES11 SP3 before Maintenance Update 11078, OES11 SP2 before Maintenance Update 11077).

/opt/novell/ncl/bin/nwrights in Novell Client for Linux in Novell Open Enterprise Server (OES) 11 Linux SP2 does not properly manage a certain array, which allows local users to obtain the S permission in opportunistic circumstances by leveraging the granting of the F permission by an administrator.