PT-2017-4212 · Gnu+5 · Gnu C Library+5

Aurelien Jarno · Published 2016-12-27 · Updated 2024-06-15 · CVE-2017-16997

Positive Technologies (AI Summary)

CVSS v2.0

9.3

High

Base vector

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

Name of the Vulnerable Software and Affected Versions GNU C Library versions 2.19 through 2.26

Description The issue is related to the fillin rpath and decompose rpath functions in the GNU C Library, which mishandle RPATH and RUNPATH containing $ORIGIN for privileged programs. This allows a local user to gain privileges via a Trojan horse library in the current working directory. The problem is associated with the misinterpretation of an empty RPATH/RUNPATH token as the "./" directory. It is noted that this configuration of RPATH/RUNPATH for a privileged program is apparently very uncommon.

Recommendations For GNU C Library versions 2.19 through 2.26, consider restricting the use of the fillin rpath and decompose rpath functions until a patch is available. As a temporary workaround, avoid using RPATH and RUNPATH containing $ORIGIN for privileged programs to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Untrusted Search Path

Weakness Enumeration

CWE-426

Related Identifiers

ALT-PU-2016-2499

ALT-PU-2017-2833

BDU:2022-05945

CESA-2018_3092

CVE-2017-16997

MGASA-2018-0096

MGASA-2018-0098

OPENSUSE-SU-2018_0089-1

OPENSUSE-SU-2024:10792-1

RHSA-2018:3092

RHSA-2018_3092

SUSE-SU-2018:0074-1

USN-3534-1

Affected Products

Alt Linux

Centos

Gnu C Library

Red Hat

Suse

Ubuntu

References · 150

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/glibc_realpath_priv_esc.rb · Exploit
• 🔥 https://github.com/qazbnm456/awesome-cve-poc/blob/master/Stack-Clash.md · Exploit
• 🔥 https://github.com/0x00-0x00/CVE-2018-1000001 · Exploit
• https://osv.dev/vulnerability/SUSE-SU-2018:0074-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2017-16997 · Vendor Advisory
• https://sourceware.org/ml/libc-alpha/2017-12/msg00528.html · Patch
• https://errata.altlinux.org/ALT-PU-2017-2833 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17426 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2024:10792-1 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6551 · Security Note
• https://osv.dev/vulnerability/USN-3534-1 · Vendor Advisory
• https://sourceware.org/bugzilla/show_bug.cgi?id=22625 · Patch
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-11236 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-3075 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15804 · Security Note