Path traversal in Linux kernel - CVE-2015-2925

Vulnerability identifier: #VU2597

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2015-2925

CWE-ID: CWE-22

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists in the prepend_path function in fs/dcache.c due to improper handling of rename actions inside a bind mount. A local attacker can bypass an intended container protection mechanism by renaming a directory, related to a "double-chroot attack" and gain root privileges.

Linux kernel
Red Hat Enterprise Linux Server from RHUI
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux Server - Extended Update Support from RHUI
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Fedora

kernel (Red Hat package)
kernel

Update to version 4.2.4.

kernel (Red Hat package) - update to 2.6.32-573.12.1.el6
kernel - addressed in versions 4.1.10-100.fc21, 4.1.10-200.fc22, 4.2.3-300.fc23

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cde93be45a8a90d8c264c776fab63487b5038a65

• Multiple vulnerabilities in Linux Kernel
• Red Hat update for kernel
• Fedora 22 update for kernel
• Fedora 21 update for kernel
• Fedora 23 update for kernel