SB2018101714 - Debian update for asterisk
Published: October 17, 2018 Updated: November 12, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Improper input validation (CVE-ID: CVE-2018-7284)
The vulnerability allows a remote attacker to cause DoS condition on the target system.The weakness exists due to improper input validation. A remote attacker can send a SUBSCRIBE request with specially crafted Accept headersб trigger a flaw in the 'res_pjsip_pubsub' module and cause the target service to crash.
2) Denial of service (CVE-ID: CVE-2018-7286)
The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.The weakness exists due to improper processing of INVITE messages received via the TCP or Transport Layer Security (TLS) protocols. A remote attacker can send a series of specially crafted INVITE messages over a TCP or TLS connection, trigger a segmentation fault and cause the system to crash.
3) Stack-based buffer overflow (CVE-ID: CVE-2018-17281)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error when processing HTTP requests within "res_http_websocket.so" module. A remote unauthenticated attacker can send a specially crafted HTTP request that triggers an HTTP websocket upgrade, causes stack overflow and consumes all available stack memory on the system.
Successful exploitation of this vulnerability may result in denial of service attack.
4) Information disclosure (CVE-ID: CVE-2018-12227)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to application responds with different error codes depending on presence of ACL rules for SIP requests. A remote attacker can identify presence of ACL rules.
Remediation
Install update from vendor's website.