Integer overflow in GNU Glibc
CVE-2020-6096
An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.055 (92.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.054 · newest: 0.055 · change: +0.001
Affected products
- GNU Glibc
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 31, 32
- GNU Glibc — versions 2.30.9000
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202101-20 (vendor-advisory, Third Party Advisory)
- lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac… (mailing-list)
- sourceware.org/bugzilla/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.talosintelligence.com/vulnerability_reports/TALOS-2020-1019 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/10/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Frequently asked questions
- What is CVE-2020-6096?
- CVE-2020-6096 is a high-severity vulnerability in GNU Glibc, classified under CWE-195. CVSS score: 8.1/10. Published 2020-04-01.
- How severe is CVE-2020-6096?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2020-6096 known to be exploited?
- 25 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.