Fedora 27 : glibc (2018-7714b514e2)

High Nessus Plugin ID 106279

New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it's different from CVSS.

VPR Score: 7.4


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: 3.6

Type: local

Agent: unix

Published: 2018/01/24

Updated: 2020/06/04

Dependencies: 12634

Risk Information

Risk Factor: High

VPR Score: 7.4

CVSS v2.0

Base Score: 9.3

Temporal Score: 7.7

Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:F/RL:OF/RC:C

CVSS v3.0

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: CVSS:3.0/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: 2018/01/23

Vulnerability Publication Date: 2017/12/18

Exploitable With

Metasploit (glibc "realpath()" Privilege Escalation)

Reference Information

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