Debian update for asterisk
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2018-7284 CVE-2018-7286 CVE-2018-17281 CVE-2018-12227 |
| CWE-ID | CWE-20 CWE-121 CWE-200 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. |
| Vulnerable software Subscribe |
asterisk (Debian package) Operating systems & Components / Operating system package or component |
| Vendor | Debian |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Improper input validation
EUVDB-ID: #VU10698
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]
CVE-ID: CVE-2018-7284
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: Yes
DescriptionThe 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.
Update the affected package to version: 1:13.14.1~dfsg-2+deb9u4.
Vulnerable software versionsasterisk (Debian package): 1:13.14.0~dfsg-1 - 1:13.14.1~dfsg-2+deb9u3
External linkshttp://www.debian.org/security/2018/dsa-4320
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. However, proof of concept for this vulnerability is available.
2) Denial of service
EUVDB-ID: #VU10713
Risk: Low
CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2018-7286
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: Yes
DescriptionThe 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.
Update the affected package to version: 1:13.14.1~dfsg-2+deb9u4.
Vulnerable software versionsasterisk (Debian package): 1:13.14.0~dfsg-1 - 1:13.14.1~dfsg-2+deb9u3
External linkshttp://www.debian.org/security/2018/dsa-4320
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. However, proof of concept for this vulnerability is available.
3) Stack-based buffer overflow
EUVDB-ID: #VU14912
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-17281
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: No
DescriptionThe 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.
Mitigation
Update the affected package to version: 1:13.14.1~dfsg-2+deb9u4.
Vulnerable software versionsasterisk (Debian package): 1:13.14.0~dfsg-1 - 1:13.14.1~dfsg-2+deb9u3
External linkshttp://www.debian.org/security/2018/dsa-4320
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.
4) Information disclosure
EUVDB-ID: #VU15804
Risk: Low
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-12227
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe 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.
MitigationUpdate the affected package to version: 1:13.14.1~dfsg-2+deb9u4.
Vulnerable software versionsasterisk (Debian package): 1:13.14.0~dfsg-1 - 1:13.14.1~dfsg-2+deb9u3
External linkshttp://www.debian.org/security/2018/dsa-4320
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.
