CVE-2020-6096: Integer Underflow
First published: Wed Apr 01 2020(Updated: )
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.
Credit: talos-cna@cisco.com talos-cna@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GNU glibc | <=2.31 | |
| Fedoraproject Fedora | =31 | |
| Fedoraproject Fedora | =32 | |
| Debian Debian Linux | =10.0 | |
| debian/glibc | 2.31-13+deb11u11 2.31-13+deb11u10 2.36-9+deb12u9 2.36-9+deb12u7 2.40-4 |
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Reference Links
- https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SPYXTDOOB4PQGTYAMZAZNJIB3FF6YQXI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/URXOIA2LDUKHQXK4BE55BQBRI6ZZG3Y6/
- https://security.gentoo.org/glsa/202101-20
- https://sourceware.org/bugzilla/show_bug.cgi?id=25620
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1019
- https://launchpad.net/bugs/cve/CVE-2020-6096
- https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPYXTDOOB4PQGTYAMZAZNJIB3FF6YQXI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URXOIA2LDUKHQXK4BE55BQBRI6ZZG3Y6/
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1019
- https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=beea361050728138b82c57dda0c4810402d342b9
- https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=79a4fa341b8a89cb03f84564fd72abaa1a2db394
- https://security-tracker.debian.org/tracker/CVE-2020-6096
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6096
- https://nvd.nist.gov/vuln/detail/CVE-2020-6096
- https://ubuntu.com/security/CVE-2020-6096
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2020-6096.
What is the severity level of CVE-2020-6096?
The severity level of CVE-2020-6096 is high with a score of 8.1.
Which software is affected by CVE-2020-6096?
The GNU glibc versions up to and including 2.31, Fedora versions 31 and 32, and Debian Linux version 10.0 are affected by CVE-2020-6096.
What is the description of CVE-2020-6096?
CVE-2020-6096 is an exploitable signed comparison vulnerability in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000.
How can CVE-2020-6096 be exploited?
CVE-2020-6096 can be exploited by calling memcpy() with a negative value for the 'num' parameter in ARMv7 targets that utilize the GNU glibc implementation.
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