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The vulnerability exists within the SNMP subsystem of Cisco IOS and IOS XE Software. A stack-based buffer overflow occurs when processing specific SNMP protocol data units (PDUs). An authenticated remote attacker can send a specially crafted SNMP packet, either via SNMPv2c read-only community strings or SNMPv3 user credentials. The flaw is triggered by improper bounds checking when copying user-supplied data into a fixed-size stack buffer. For low-privileged attackers, sending this packet causes the device to reload, resulting in a Denial of Service (DoS). A high-privileged attacker with administrative credentials can leverage the same overflow to overwrite the function return address on the stack, allowing for arbitrary code execution with root-level privileges on the underlying operating system of Cisco IOS XE devices. The exploitation occurs over the network via IPv4 or IPv6.
Platform: Cisco IOS/XE
Version: Multiple versions
Vulnerability: Stack Overflow
Severity: Critical
date: 2023
Prediction: 2023-Q2
What Undercode Say:
snmpwalk -v2c -c public <target_ip> snmp-check <target_ip> -c public -v2c msfconsole -q -x "use exploit/linux/snmp/cisco_ios_xe_snmp_stack_overflow; set RHOST <target>; set COMMUNITY public; exploit"
// POC code structure for SNMP packet crafting
struct crafted_pdu {
char version;
char community[bash];
struct pdu_type type;
char payload[bash]; // Overflow trigger
};
How Exploit:
Crafted SNMP Packet
Stack Buffer Overflow
Arbitrary Code Execution
Protection from this CVE:
Disable SNMP
Apply Patches
Access Control Lists
Impact:
Denial of Service
Remote Code Execution
Full System Compromise
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: www.cve.org
Extra Source Hub:
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