7.5
HIGH
CVE-2016-6515
OpenSSH Password Length DoS Vulnerability
Description

The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.

INFO

Published Date :

Aug. 7, 2016, 9:59 p.m.

Last Modified :

Nov. 7, 2023, 2:34 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2016-6515 has a 19 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2016-6515 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fedoraproject fedora
1 Openbsd openssh
: Total Affected Vendor : 2 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2016-6515.

URL Resource
http://openwall.com/lists/oss-security/2016/08/01/2 Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/140070/OpenSSH-7.2-Denial-Of-Service.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.securityfocus.com/bid/92212
http://www.securitytracker.com/id/1036487
https://access.redhat.com/errata/RHSA-2017:2029
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf
https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97 Issue Tracking Patch
https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:06.openssh.asc
https://security.netapp.com/advisory/ntap-20171130-0003/
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us
https://www.exploit-db.com/exploits/40888/

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
scmanjarrez/test

None

Lua Python Dockerfile

Updated: 5 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : April 1, 2024, 9:13 a.m. This repo has been linked 9 different CVEs too.
Profile Photo
bioly230/THM_Skynet

None

Updated: 1 year, 2 months ago
0 stars 0 fork 0 watcher
Born at : June 30, 2023, 2:41 p.m. This repo has been linked 78 different CVEs too.
Profile Photo
CVEDB/awesome-cve-repo

None

Shell

Updated: 1 week, 4 days ago
3 stars 2 fork 2 watcher
Born at : March 23, 2023, 4:32 a.m. This repo has been linked 435 different CVEs too.
Profile Photo
CVEDB/top

None

Shell

Updated: 1 week, 4 days ago
1 stars 0 fork 0 watcher
Born at : March 19, 2023, 1:53 a.m. This repo has been linked 265 different CVEs too.
Profile Photo
weeka10/-hktalent-TOP

None

Shell

Updated: 1 year, 6 months ago
2 stars 0 fork 0 watcher
Born at : Nov. 16, 2022, 9:38 a.m. This repo has been linked 256 different CVEs too.
Profile Photo
cyberanand1337x/bug-bounty-2022

None

Updated: 1 year, 8 months ago
0 stars 0 fork 0 watcher
Born at : Sept. 30, 2022, 6:29 p.m. This repo has been linked 253 different CVEs too.
Profile Photo
jbmihoub/all-poc

None

Shell

Updated: 1 month, 1 week ago
1 stars 1 fork 1 watcher
Born at : Aug. 25, 2022, 12:16 a.m. This repo has been linked 250 different CVEs too.
Profile Photo
anquanscan/sec-tools

None

Updated: 1 week, 6 days ago
17 stars 5 fork 5 watcher
Born at : July 28, 2022, 3:22 a.m. This repo has been linked 149 different CVEs too.
Profile Photo
GhostTroops/TOP

TOP All bugbounty pentesting CVE-2023- POC Exp RCE example payload Things

bugbounty cve exp exploit payload poc rce vulnerability

Shell

Updated: 1 week, 4 days ago
647 stars 116 fork 116 watcher
Born at : March 19, 2022, 1:54 a.m. This repo has been linked 273 different CVEs too.
Profile Photo
retr0-13/cveScannerV2

None

Lua Python

Updated: 6 months, 3 weeks ago
1 stars 0 fork 0 watcher
Born at : March 10, 2022, 10:55 a.m. This repo has been linked 29 different CVEs too.
Profile Photo
phx/cvescan

Easily scan for CVEs using nmap.

cve nmap portscanning shell shellscript automation

Shell

Updated: 3 weeks, 5 days ago
10 stars 2 fork 2 watcher
Born at : Jan. 13, 2022, 2:44 p.m. This repo has been linked 34 different CVEs too.
Profile Photo
jptr218/openssh_dos

A proof of concept for CVE-2016-6515

C++

Updated: 3 years ago
1 stars 0 fork 0 watcher
Born at : Aug. 26, 2021, 5:44 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
scmanjarrez/CVEScannerV2

Nmap script that scans for probable vulnerabilities based on services discovered in open ports.

nmap nmap-script nmap-scan-script exploit-db nmap-scan metasploit vulnerability-scanners security-scanner vulnerability-detection vulnerability nsescript nmap-scripts penetration-testing vulnerability-scanning vulnerability-identification vulnerability-databases exploit security security-audit nse

Lua Python Dockerfile

Updated: 1 week, 5 days ago
107 stars 13 fork 13 watcher
Born at : Aug. 11, 2021, 12:57 p.m. This repo has been linked 9 different CVEs too.
Profile Photo
vshaliii/Basic-Pentesting-2-Vulnhub-Walkthrough

This is a boot2root VM and is a continuation of the Basic Pentesting series. This series is designed to help newcomers to penetration testing develop pentesting skills and have fun exploring part of the offensive side of security. VirtualBox is the recommended platform for this challenge (though it should also work with VMware -- however, I haven’t tested that). This VM is a moderate step up in difficulty from the first entry in this series. If you’ve solved the first entry and have tried a few other beginner-oriented challenges, this VM should be a good next step. Once again, this challenge contains multiple initial exploitation vectors and privilege escalation vulnerabilities. Your goal is to remotely attack the VM, gain root privileges, and read the flag located at /root/flag.txt. Once you’ve finished, try to find other vectors you might have missed! If you’d like to send me a link to your writeup, enjoyed the VM or have questions or feedback, feel free to contact me at: [email protected] If you finished the VM, please also consider posting a writeup! Writeups help you internalize what you worked on and help anyone else who might be struggling or wants to see someone else’s process. There were lots of wonderful writeups for Basic Pentesting: 1, and I look forward to reading the writeups for this challenge.

Updated: 1 year, 2 months ago
5 stars 5 fork 5 watcher
Born at : May 25, 2021, 9:07 a.m. This repo has been linked 78 different CVEs too.
Profile Photo
n0-traces/cve_monitor

Automatic monitor github cve using Github Actions

Python

Updated: 2 years, 11 months ago
0 stars 56 fork 56 watcher
Born at : April 7, 2021, 11:16 a.m. This repo has been linked 1007 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2016-6515 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2016-6515 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/ [No types assigned]
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
  • CVE Modified by [email protected]

    Dec. 13, 2022

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf [No Types Assigned]
  • CVE Modified by [email protected]

    Sep. 14, 2021

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf [No Types Assigned]
  • CVE Modified by [email protected]

    Sep. 11, 2018

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html [No Types Assigned]
  • CVE Modified by [email protected]

    May. 10, 2018

    Action Type Old Value New Value
    Added Reference https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us [No Types Assigned]
  • CVE Modified by [email protected]

    Jan. 05, 2018

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/errata/RHSA-2017:2029 [No Types Assigned]
  • CVE Modified by [email protected]

    Dec. 02, 2017

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20171130-0003/ [No Types Assigned]
  • CVE Modified by [email protected]

    Nov. 21, 2017

    Action Type Old Value New Value
    Added Reference https://security.FreeBSD.org/advisories/FreeBSD-SA-17:06.openssh.asc [No Types Assigned]
  • CVE Modified by [email protected]

    Oct. 20, 2017

    Action Type Old Value New Value
    Added Reference http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html [No Types Assigned]
  • CVE Modified by [email protected]

    Sep. 01, 2017

    Action Type Old Value New Value
    Added Reference http://www.securitytracker.com/id/1036487 [No Types Assigned]
  • CVE Modified by [email protected]

    Dec. 23, 2016

    Action Type Old Value New Value
    Added Reference https://www.exploit-db.com/exploits/40888/ [No Types Assigned]
    Added Reference http://packetstormsecurity.com/files/140070/OpenSSH-7.2-Denial-Of-Service.html [No Types Assigned]
  • CVE Modified by [email protected]

    Nov. 28, 2016

    Action Type Old Value New Value
    Added Reference http://www.securityfocus.com/bid/92212 [No Types Assigned]
  • Modified Analysis by [email protected]

    Aug. 23, 2016

    Action Type Old Value New Value
    Changed CPE Configuration Configuration 1 OR *cpe:2.3:a:openbsd:openssh:7.2:p2:*:*:*:*:*:* (and previous) Configuration 1 OR *cpe:2.3:a:openbsd:openssh:7.2:p2:*:*:*:*:*:* (and previous) Configuration 2 OR *cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/ Third Party Advisory
  • CVE Modified by [email protected]

    Aug. 23, 2016

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
  • Modified Analysis by [email protected]

    Aug. 10, 2016

    Action Type Old Value New Value
    Added CPE Configuration Configuration 1 OR *cpe:2.3:a:openbsd:openssh:7.2:p2:*:*:*:*:*:* (and previous)
    Added CVSS V2 (AV:N/AC:L/Au:N/C:N/I:N/A:C)
    Added CVSS V3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97 No Types Assigned https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97 Issue Tracking, Patch
    Changed Reference Type http://openwall.com/lists/oss-security/2016/08/01/2 No Types Assigned http://openwall.com/lists/oss-security/2016/08/01/2 Third Party Advisory, VDB Entry
    Added CWE CWE-20
  • Initial Analysis by [email protected]

    Aug. 10, 2016

    Action Type Old Value New Value
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2016-6515 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2016-6515 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-23: File Content Injection File Content Injection CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-31: Accessing/Intercepting/Modifying HTTP Cookies Accessing/Intercepting/Modifying HTTP Cookies CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-63: Cross-Site Scripting (XSS) Cross-Site Scripting (XSS) CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-73: User-Controlled Filename User-Controlled Filename CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-81: Web Server Logs Tampering Web Server Logs Tampering CAPEC-83: XPath Injection XPath Injection CAPEC-85: AJAX Footprinting AJAX Footprinting CAPEC-88: OS Command Injection OS Command Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-104: Cross Zone Scripting Cross Zone Scripting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-109: Object Relational Mapping Injection Object Relational Mapping Injection CAPEC-110: SQL Injection through SOAP Parameter Tampering SQL Injection through SOAP Parameter Tampering CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-136: LDAP Injection LDAP Injection CAPEC-153: Input Data Manipulation Input Data Manipulation CAPEC-182: Flash Injection Flash Injection CAPEC-209: XSS Using MIME Type Mismatch XSS Using MIME Type Mismatch CAPEC-230: Serialized Data with Nested Payloads Serialized Data with Nested Payloads CAPEC-231: Oversized Serialized Data Payloads Oversized Serialized Data Payloads CAPEC-250: XML Injection XML Injection CAPEC-261: Fuzzing for garnering other adjacent user/sensitive data Fuzzing for garnering other adjacent user/sensitive data CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-473: Signature Spoof Signature Spoof CAPEC-588: DOM-Based XSS DOM-Based XSS CAPEC-664: Server Side Request Forgery Server Side Request Forgery
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

4.50 }} -12.10%

score

0.92577

percentile

CVSS30 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: