Denial of service in Digium Asterisk



Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID N/A
CWE-ID CWE-120
CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Certified Asterisk
Server applications / Conferencing, Collaboration and VoIP solutions

Asterisk Open Source
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor Digium (Linux Support Services)

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU9147

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-120 - Buffer overflow

Exploit availability: No

Description

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

The weakness exists in CDR's set user due to buffer overflow when setting the user field for Party B on a call detail record (CDR). A remote attacker can send large string that is designed to write past the end of the user field storage buffer and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update Asterisk to version 13.18.1, 14.7.1, 15.1.1.
Update Certified Asterisk to version 13.13-cert7.

Vulnerable software versions

Certified Asterisk: 13.13

Asterisk Open Source: 13.0.0 - 15.1.0

CPE2.3 External links

http://downloads.asterisk.org/pub/security/AST-2017-010.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource exhaustion

EUVDB-ID: #VU9148

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The weakness exists in pjsip session resource due to insufficient handling of session objects. A remote attacker can submit specially crafted session objects for processing, consume excessive resources and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update Asterisk to version 13.18.1, 14.7.1, 15.1.1.
Update Certified Asterisk to version 13.13-cert7.

Vulnerable software versions

Certified Asterisk: 13.13

Asterisk Open Source: 13.0.0 - 15.1.0

CPE2.3 External links

http://downloads.asterisk.org/pub/security/AST-2017-011.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Buffer overflow

EUVDB-ID: #VU9149

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-120 - Buffer overflow

Exploit availability: No

Description

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

The weakness exists in the pjproject component due to improper processing of crafted invalid values in the Cseq and the Via header port. A remote attacker can submit specially crafted invalid values, trigger buffer overflow and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update Asterisk to version 13.18.1, 14.7.1, 15.1.1.
Update Certified Asterisk to version 13.13-cert7.

Vulnerable software versions

Certified Asterisk: 13.13

Asterisk Open Source: 13.0.0 - 15.1.0

CPE2.3 External links

http://downloads.asterisk.org/pub/security/AST-2017-009.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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