SB2018022218 - Denial of service in Digium Asterisk

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Main Vulnerability Database SB2018022218

SB2018022218 - Denial of service in Digium Asterisk

Published: February 22, 2018 Updated: February 26, 2018

Security Bulletin ID SB2018022218
Severity
Low
Patch available
YES
Number of vulnerabilities 6
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 6 secuirty vulnerabilities.


1) Improper input validation (CVE-ID: CVE-2018-7285)

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 specially crafted RTP data during SDP negotiation, trigger a payload number error and cause the service to crash.

2) 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.

3) Denial of service (CVE-ID: N/A)

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The weakness exists due to insufficient validation of Session Description Protocol (SDP) messages. A remote attacker can submit a specially crafted SDP message, which contains an improper fmtp attribute and cause the service to crash.

4) Denial of service (CVE-ID: N/A)

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The weakness exists due to insufficient validation of Session Description Protocol (SDP) messages. A remote attacker can submit a specially crafted SDP message, which contains an improper media format description and cause the service to crash.

5) Infinite loop (CVE-ID: CVE-2018-7287)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the res_http_websocket.c code due to insufficient length checks on WebSocket frames. A remote attacker can send send WebSocket frames with a zero-length payload, trigger a busy loop condition until the underlying socket on the system is closed and cause the service to crash.

6) 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.

Remediation

Install update from vendor's website.

References