SB2022120212 - Multiple vulnerabilities in Asterisk Open Source and Certified Asterisk

Description

This security bulletin contains information about 3 vulnerabilities.

1) Integer underflow (CVE-ID: CVE-2022-37325)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an integer underflow within the ooh323 module. A remote non-authenticated attacker can initiate a call with a zero length called or calling party number, trigger an integer underflow and crash Asterisk.

2) Improper Privilege Management (CVE-ID: CVE-2022-42706)

CWE-ID: CWE-269 - Improper Privilege Management

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to escalate privileges.

The vulnerability exists due to improper privilege management. A remote user with “config” permissions can view files outside of Asterisk directory via GetConfig AMI Action even if “live_dangerously" is set to "no".

3) Use-after-free (CVE-ID: CVE-2022-42705)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within res_pjsip_pubsub.c, res_pjsip_outbound_registration.c, pjsip_transport_events.c files when performing activity on a subscription via a reliable transport at the same time Asterisk is also performing activty on that subscription. A remote user can trigger a use-after-free error and perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://downloads.asterisk.org/pub/security/AST-2022-007.html
• https://downloads.asterisk.org/pub/security/AST-2022-009.html
• https://downloads.asterisk.org/pub/security/AST-2022-008.html