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Q1What is this vulnerability? (Essence + Consequences)
๐จ **The Essence**: A DoS vulnerability in Asterisk's `chan_skinny.c` file. ๐ฅ **Consequences**: Attackers send massive requests, causing **excessive virtual memory consumption**.โฆ
๐ **Root Cause**: Resource exhaustion flaw in `chan_skinny.c`. ๐ **CWE**: Not explicitly mapped in data, but effectively a **Resource Management Error** leading to Denial of Service via memory exhaustion.
Q3Who is affected? (Versions/Components)
๐ข **Vendor**: Digium. ๐ฆ **Products**: Asterisk Open Source & Certified Asterisk. ๐ **Affected Versions**: Asterisk Open Source **13.18.2 and earlier**. (Check your version immediately!)
Q4What can hackers do? (Privileges/Data)
๐ฏ **Attacker Goal**: Denial of Service (DoS). ๐ซ **Impact**: System becomes unresponsive due to memory spikes. ๐ **Privileges**: No RCE or data exfiltration mentioned. Just **service disruption**.
Q5Is exploitation threshold high? (Auth/Config)
โก **Exploitation Threshold**: Likely **Low** for network-accessible Skinny Client Control Protocol (SCCP) channels.โฆ
๐ **Public Exploit**: No specific PoC code listed in data. ๐ข **References**: JIRA ticket `ASTERISK-27452` and SecurityFocus BID `102023` confirm the issue. Wild exploitation is possible via traffic flooding.
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**: 1. Check Asterisk version (`< 13.18.2`). 2. Monitor for SCCP (`chan_skinny`) usage. 3. Look for sudden **virtual memory spikes** under load. ๐ **Scanning**: Identify open SCCP ports (2000/tcp).
Q8Is it fixed officially? (Patch/Mitigation)
๐ก๏ธ **Official Fix**: YES. ๐ฅ **Patch**: Digium released security update **AST-2017-013**. Debian LTS also issued DLA 1225-1. ๐ **Action**: Upgrade to patched version immediately.
Q9What if no patch? (Workaround)
๐ง **No Patch Workaround**: 1. **Disable** `chan_skinny` module if not used. 2. **Firewall**: Restrict access to SCCP ports. 3. **Rate Limit**: Limit request rates to prevent memory exhaustion.โฆ
๐ฅ **Urgency**: **HIGH** for SCCP users. โ ๏ธ **Priority**: Critical for availability. While no data loss, DoS disrupts business operations. ๐ **Recommendation**: Patch ASAP if running affected versions.