Use After Free in GNU Glibc
CVE-2020-1752
A use-after-free vulnerability introduced in glibc upstream version 2.14 was found in the way the tilde expansion was carried out. Directory paths containing an initial tilde followed by a valid username were affected by this issue. A local attacker could exploit this flaw by creating a specially crafted path that, when processed by the glob function, would potentially lead to arbitrary code execution. This was fixed in version 2.32.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- GNU Glibc
- GNU Libc Glibc — versions Affected: versions 2.14 and later, Fixed: version 2.32
- NetApp Active Iq Unified Manager
- NetApp H410c
- NetApp H410c Firmware
- NetApp Hci Management Node
- NetApp Solidfire
- NetApp Steelstore Cloud Integrated Storage
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.10
- Debian Linux — versions 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- sourceware.org/bugzilla/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- sourceware.org/git/gitweb.cgi
- security.netapp.com/advisory/ntap-20200511-0005/ (Third Party Advisory)
- usn.ubuntu.com/4416-1/ (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202101-20 (vendor-advisory, Third Party Advisory)
- lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a4508… (mailing-list)
- lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698… (mailing-list)
- lists.debian.org/debian-lts-announce/2022/10/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1752?
- CVE-2020-1752 is a high-severity vulnerability in GNU Glibc, classified under Use After Free. CVSS score: 7.0/10. Published 2020-04-30.
- How severe is CVE-2020-1752?
- High severity. CVSS v3 base score is 7.0 out of 10.
- Is CVE-2020-1752 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.