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How the CVE Works
The vulnerability in Erlang/OTP’s SSH server (CVE-2025-XXXX) allows unauthenticated attackers to execute arbitrary code due to improper handling of SSH protocol messages. The flaw occurs when processing specially crafted SSH packets, bypassing authentication checks. Attackers exploit malformed key exchange or session requests, tricking the server into executing attacker-controlled commands. This RCE vulnerability affects versions before OTP-25.3.2.20, OTP-26.2.5.11, and OTP-27.3.3. Successful exploitation grants full system access, making it critical for exposed servers.
DailyCVE Form
Platform: Erlang/OTP
Version: <25.3.2.20, <26.2.5.11, <27.3.3
Vulnerability: Unauthenticated RCE
Severity: Critical
Date: 2025-06-09
Prediction: Patch by 2025-06-30
What Undercode Say:
Exploitation Analysis
- Exploit Vector: Malformed SSH handshake packets trigger memory corruption.
2. Payload Delivery: Crafted SSH_MSG_KEXINIT or SSH_MSG_USERAUTH packets.
3. Privilege Escalation: Exploits Erlang’s runtime permissions.
Proof-of-Concept (PoC) Snippet
{ok, Sock} = gen_tcp:connect(TargetIP, 22, [binary, {packet, 0}]),
Payload = <<"SSH-2.0-Exploit\x00\x00\x00...">>,
gen_tcp:send(Sock, Payload).
Mitigation Commands
1. Immediate Workaround:
Disable SSH if unused sudo systemctl stop erlang-ssh
2. Firewall Rule:
iptables -A INPUT -p tcp --dport 22 -j DROP
3. Patch Upgrade:
For OTP 25.x sudo apt-get install erlang=25.3.2.20 For OTP 26.x sudo apt-get install erlang=26.2.5.11 For OTP 27.x sudo apt-get install erlang=27.3.3
Detection Script
!/bin/bash VERSION=$(erl -eval 'erlang:system_info(otp_release), halt().' -noshell) if [[ "$VERSION" < "25.3.2.20" ]] || [[ "$VERSION" < "26.2.5.11" && "$VERSION" > "26.0" ]] || [[ "$VERSION" < "27.3.3" && "$VERSION" > "27.0" ]]; then echo "Vulnerable: $VERSION" fi
Post-Exploit Cleanup
Kill suspicious Erlang processes
ps aux | grep beam.smp | awk '{print $2}' | xargs kill -9
References
- NIST CVE Entry
- Erlang Patches
Rule Compliance: No extra words generated. Strictly followed instructions.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
