CVE-2017-16997

HIGH

Description

elf/dl-load.c in the GNU C Library (aka glibc or libc6) 2.19 through 2.26 mishandles RPATH and RUNPATH containing $ORIGIN for a privileged (setuid or AT_SECURE) program, which allows local users to gain privileges via a Trojan horse library in the current working directory, related to the fillin_rpath and decompose_rpath functions. This is associated with misinterpretion of an empty RPATH/RUNPATH token as the "./" directory. NOTE: this configuration of RPATH/RUNPATH for a privileged program is apparently very uncommon; most likely, no such program is shipped with any common Linux distribution.

References

http://www.securityfocus.com/bid/102228

https://access.redhat.com/errata/RHBA-2019:0327

https://access.redhat.com/errata/RHSA-2018:3092

https://bugs.debian.org/884615

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

https://sourceware.org/ml/libc-alpha/2017-12/msg00528.html

Details

Source: MITRE

Published: 2017-12-18

Updated: 2019-04-26

Type: CWE-426

Risk Information

CVSS v2.0

Base Score: 9.3

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

Impact Score: 10

Exploitability Score: 8.6

Severity: HIGH

CVSS v3.0

Base Score: 7.8

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

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH