ET EXPLOIT Cisco REST API Container for Cisco IOS XE Software Authentication Bypass - Successful Exploit (CVE-2019-12643)

Query · suricata

flow:established,to_client;
flowbits:isset,ET.Cisco_ABypass;
http.stat_code;
content:"200";
file.data; strip_whitespace;
content:"|5b 7b 22|last-access-time|22 3a|"; fast_pattern;
content:"|22|token-id|22 3a 22|"; within:200;
pcre:"/^[a-zA-Z0-9]{5,40}/R";
xbits:set,ET.Cisco_ABypass,track ip_pair,expire 60;
target:dest_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Feeds into

  • 1 rule read ET.Cisco_ABypass · view all
Raw source ET EXPLOIT Cisco REST API Container for Cisco IOS XE Software Authentication Bypass - Successful Exploit (CVE-2019-12643) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http [$HOME_NET,$HTTP_SERVERS] 55443 -> any any (
    msg:"ET EXPLOIT Cisco REST API Container for Cisco IOS XE Software Authentication Bypass - Successful Exploit (CVE-2019-12643)";
    flow:established,to_client;
    flowbits:isset,ET.Cisco_ABypass;
    http.stat_code;
    content:"200";
    file.data; strip_whitespace;
    content:"|5b 7b 22|last-access-time|22 3a|"; fast_pattern;
    content:"|22|token-id|22 3a 22|"; within:200;
    pcre:"/^[a-zA-Z0-9]{5,40}/R";
    xbits:set,ET.Cisco_ABypass,track ip_pair,expire 60;
    reference:cve,2019-12643;
    classtype:successful-admin;
    sid:2035011; rev:3;
    metadata:affected_product Cisco_IOS, attack_target Networking_Equipment, created_at 2022_01_28, cve CVE_2019_12643, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_08_20, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)

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