Insecure DLL loading in GNU C Library (glibc) - CVE-2017-16997

Vulnerability identifier: #VU11547

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-2017-16997

CWE-ID: CWE-427

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to compromise vulnerable system.

The weakness exists in elf/dl-load.c due to insecure .dll loading mechanism when opening files. Alocal attacker can place a file along with specially crafted .dll file on a remote SBM or WebDAV share and execute arbitrary code on the target system with elevated privileges.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

GNU C Library (glibc)
Gentoo Linux
Amazon Linux AMI
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power
SUSE Linux
Fedora
Opensuse
Red Hat Virtualization Host
glibc

Update to version 2.27.

glibc - addressed in versions 2.25-13.fc26, 2.26-24.fc27

• https://sourceware.org/bugzilla/show_bug.cgi?id=22625

• Gentoo update for glibc
• Amazon Linux AMI update for glibc
• Red Hat update for glibc
• OpenSUSE Linux update for glibc
• SUSE Linux update for glibc
• Fedora 27 update for glibc
• Fedora 26 update for glibc