Fedora 27 : glibc (2018-7714b514e2)

high Nessus Plugin ID 106279


New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote Fedora host is missing a security update.


This update addresses two security vulnerabilities :

- CVE-2017-16997: Check for empty tokens before dynamic string token expansion in the dynamic linker, so that pre-existing privileged programs with `$ORIGIN` rpaths/runpaths do not cause the dynamic linker to search the current directory, potentially leading to privilege escalation. (RHBZ#1526866).

- CVE-2018-1000001: `getcwd` would sometimes return a non-absolute path, confusing the `realpath` function, leading to privilege escalation in conjunction with user namespaces. (RHBZ#1533837)

In addition, this update changes the thread stack size accounting to provide additional stack space compared to previous glibc versions.
For some applications (`nptd` in particular), the `PTHREAD_STACK_MIN` stack size was too small on x86-64 machines with AVX-512 support (RHBZ#1527887).

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Update the affected glibc package.

See Also


Plugin Details

Severity: High

ID: 106279

File Name: fedora_2018-7714b514e2.nasl

Version: 3.7

Type: local

Agent: unix

Published: 1/24/2018

Updated: 1/6/2021

Dependencies: ssh_get_info.nasl

Risk Information


Risk Factor: High

Score: 7.4


Risk Factor: High

Base Score: 9.3

Temporal Score: 7.7

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:F/RL:OF/RC:C


Risk Factor: High

Base Score: 7.8

Temporal Score: 7.2

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: E:F/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:fedoraproject:fedora:glibc, cpe:/o:fedoraproject:fedora:27

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/23/2018

Vulnerability Publication Date: 12/18/2017

Exploitable With

Metasploit (glibc "realpath()" Privilege Escalation)

Reference Information

CVE: CVE-2017-16997, CVE-2018-1000001