CVE-2015-6806: Buffer Overflow
First published: Mon Sep 28 2015(Updated: )
The MScrollV function in ansi.c in GNU screen 4.3.1 and earlier does not properly limit recursion, which allows remote attackers to cause a denial of service (stack consumption) via an escape sequence with a large repeat count value.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/screen | <4.1.0~20120320 | 4.1.0~20120320 |
| ubuntu/screen | <4.3.1-2 | 4.3.1-2 |
| debian/screen | 4.8.0-6 4.9.0-4 4.9.1-1 | |
| Ubuntu | <=4.3.1 |
Remedy
http://git.savannah.gnu.org/cgit/screen.git/commit/?id=c336a32a1dcd445e6b83827f83531d4c6414e2cd
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://git.savannah.gnu.org/cgit/screen.git/commit/?id=b7484c224738247b510ed0d268cd577076958f1b
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00001.html
- http://www.debian.org/security/2015/dsa-3352
- http://www.openwall.com/lists/oss-security/2015/09/01/1
- http://www.openwall.com/lists/oss-security/2015/09/03/11
- http://www.openwall.com/lists/oss-security/2015/09/03/4
- https://savannah.gnu.org/bugs/?45713
- https://usn.ubuntu.com/3996-1/
- https://launchpad.net/bugs/cve/CVE-2015-6806
- https://www.openwall.com/lists/oss-security/2015/09/01/1
- https://security-tracker.debian.org/tracker/CVE-2015-6806
- https://ubuntu.com/security/notices/USN-3996-1
- https://www.cve.org/CVERecord?id=CVE-2015-6806
- https://nvd.nist.gov/vuln/detail/CVE-2015-6806
- http://git.savannah.gnu.org/cgit/screen.git/commit/?id=c336a32a1dcd445e6b83827f83531d4c6414e2cd
- https://ubuntu.com/security/CVE-2015-6806
Frequently Asked Questions
What is the vulnerability severity of CVE-2015-6806?
CVE-2015-6806 is classified as a medium severity vulnerability due to its potential for causing denial of service through stack consumption.
How do I fix CVE-2015-6806?
To remediate CVE-2015-6806, upgrade GNU screen to version 4.3.1-2 or later.
Which versions of GNU screen are affected by CVE-2015-6806?
CVE-2015-6806 affects GNU screen versions up to and including 4.3.1.
Can CVE-2015-6806 be exploited remotely?
Yes, CVE-2015-6806 can be exploited remotely via an escape sequence with a large repeat count value.
What symptoms indicate an exploit of CVE-2015-6806?
Symptoms of CVE-2015-6806 exploitation include unexpected crashes or unresponsiveness of the GNU screen application.
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/type
- agent/severity
- agent/remedy
- agent/weakness
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/event
- collector/usn-cve
- source/Ubuntu
- agent/software-canonical-lookup
- agent/references
- collector/security-tracker-debian
- source/Debian
- agent/trending
- agent/source
- agent/author
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- collector/nvd-cve
- source/NVD
- agent/softwarecombine
- package-manager/ubuntu
- package-manager/debian
- vendor/gnu
- canonical/ubuntu
- version/ubuntu/4.3.1