An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x through 16.4.0, and Certified Asterisk through 13.21-cert3. A pointer dereference in chan_sip while handling SDP negotiation allows an attacker to crash Asterisk when handling an SDP answer to an outgoing T.38 re-invite. To exploit this vulnerability an attacker must cause the chan_sip module to send a T.38 re-invite request to them. Upon receipt, the attacker must send an SDP answer containing both a T.38 UDPTL stream and another media stream containing only a codec (which is not permitted according to the chan_sip configuration).

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x     through 16.4.0, and Certified Asterisk through 13.21-cert3. A pointer dereference in chan_sip while     handling SDP negotiation allows an attacker to crash Asterisk when handling an SDP answer to an outgoing     T.38 re-invite. To exploit this vulnerability an attacker must cause the chan_sip module to send a T.38     re-invite request to them. Upon receipt, the attacker must send an SDP answer containing both a T.38 UDPTL     stream and another media stream containing only a codec (which is not permitted according to the chan_sip     configuration). (CVE-2019-13161)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Buffer overflow in res_pjsip_messaging in Digium Asterisk versions 13.21-cert3, 13.27.0, 15.7.2, 16.4.0
    and earlier allows remote authenticated users to crash Asterisk by sending a specially crafted SIP MESSAGE
    message. (CVE-2019-12827)

  - An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x
    through 16.4.0, and Certified Asterisk through 13.21-cert3. A pointer dereference in chan_sip while
    handling SDP negotiation allows an attacker to crash Asterisk when handling an SDP answer to an outgoing
    T.38 re-invite. To exploit this vulnerability an attacker must cause the chan_sip module to send a T.38
    re-invite request to them. Upon receipt, the attacker must send an SDP answer containing both a T.38 UDPTL
    stream and another media stream containing only a codec (which is not permitted according to the chan_sip
    configuration). (CVE-2019-13161)

  - res_pjsip_t38 in Sangoma Asterisk 15.x before 15.7.4 and 16.x before 16.5.1 allows an attacker to trigger
    a crash by sending a declined stream in a response to a T.38 re-invite initiated by Asterisk. The crash
    occurs because of a NULL session media object dereference. (CVE-2019-15297)

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - An Integer Signedness issue (for a return code) in the res_pjsip_sdp_rtp module in Digium Asterisk
    versions 15.7.1 and earlier and 16.1.1 and earlier allows remote authenticated users to crash Asterisk via
    a specially crafted SDP protocol violation. (CVE-2019-7251)

  - Buffer overflow in res_pjsip_messaging in Digium Asterisk versions 13.21-cert3, 13.27.0, 15.7.2, 16.4.0
    and earlier allows remote authenticated users to crash Asterisk by sending a specially crafted SIP MESSAGE
    message. (CVE-2019-12827)

  - An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x
    through 16.4.0, and Certified Asterisk through 13.21-cert3. A pointer dereference in chan_sip while
    handling SDP negotiation allows an attacker to crash Asterisk when handling an SDP answer to an outgoing
    T.38 re-invite. To exploit this vulnerability an attacker must cause the chan_sip module to send a T.38
    re-invite request to them. Upon receipt, the attacker must send an SDP answer containing both a T.38 UDPTL
    stream and another media stream containing only a codec (which is not permitted according to the chan_sip
    configuration). (CVE-2019-13161)

  - res_pjsip_t38 in Sangoma Asterisk 15.x before 15.7.4 and 16.x before 16.5.1 allows an attacker to trigger
    a crash by sending a declined stream in a response to a T.38 re-invite initiated by Asterisk. The crash
    occurs because of a NULL session media object dereference. (CVE-2019-15297)

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Buffer overflow in DNS SRV and NAPTR lookups in Digium Asterisk 15.x before 15.6.2 and 16.x before 16.0.1
    allows remote attackers to crash Asterisk via a specially crafted DNS SRV or NAPTR response, because a
    buffer size is supposed to match an expanded length but actually matches a compressed length.
    (CVE-2018-19278)

  - An Integer Signedness issue (for a return code) in the res_pjsip_sdp_rtp module in Digium Asterisk
    versions 15.7.1 and earlier and 16.1.1 and earlier allows remote authenticated users to crash Asterisk via
    a specially crafted SDP protocol violation. (CVE-2019-7251)

  - Buffer overflow in res_pjsip_messaging in Digium Asterisk versions 13.21-cert3, 13.27.0, 15.7.2, 16.4.0
    and earlier allows remote authenticated users to crash Asterisk by sending a specially crafted SIP MESSAGE
    message. (CVE-2019-12827)

  - An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x
    through 16.4.0, and Certified Asterisk through 13.21-cert3. A pointer dereference in chan_sip while
    handling SDP negotiation allows an attacker to crash Asterisk when handling an SDP answer to an outgoing
    T.38 re-invite. To exploit this vulnerability an attacker must cause the chan_sip module to send a T.38
    re-invite request to them. Upon receipt, the attacker must send an SDP answer containing both a T.38 UDPTL
    stream and another media stream containing only a codec (which is not permitted according to the chan_sip
    configuration). (CVE-2019-13161)

  - res_pjsip_t38 in Sangoma Asterisk 15.x before 15.7.4 and 16.x before 16.5.1 allows an attacker to trigger
    a crash by sending a declined stream in a response to a T.38 re-invite initiated by Asterisk. The crash
    occurs because of a NULL session media object dereference. (CVE-2019-15297)

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2969 advisory.

    Brief introduction CVE-2019-13161 Description CVE-2019-18610 Description CVE-2019-18790 Description     CVE-2019-18976 Description CVE-2020-28242 Description For Debian 9 stretch, these problems have been fixed     in version 1:13.14.1~dfsg-2+deb9u6. We recommend that you upgrade your asterisk packages. For the detailed     security status of asterisk please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/asterisk Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Asterisk project reports :

When T.38 faxing is done in Asterisk a T.38 reinvite may be sent to an endpoint to switch it to T.38. If the endpoint responds with an improperly formatted SDP answer including both a T.38 UDPTL stream and an audio or video stream containing only codecs not allowed on the SIP peer or user a crash will occur. The code incorrectly assumes that there will be at least one common codec when T.38 is also in the SDP answer.

ID	Name	Product	Family	Severity
252381	Linux Distros Unpatched Vulnerability : CVE-2019-13161	Nessus	Misc.	medium
403583	Alpine: asterisk: security update to 16.3.0-r2	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
403583	Alpine: asterisk: security update to 16.3.0-r2	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
403577	Alpine: asterisk: security update to 15.7.4-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
403577	Alpine: asterisk: security update to 15.7.4-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
403575	Alpine: asterisk: security update to 15.6.2-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
403575	Alpine: asterisk: security update to 15.6.2-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
159473	Debian DLA-2969-1 : asterisk - LTS security update	Nessus	Debian Local Security Checks	high
126668	FreeBSD : asterisk -- Remote Crash Vulnerability in chan_sip channel driver (e9d2e981-a46d-11e9-bed9-001999f8d30b)	Nessus	FreeBSD Local Security Checks	medium

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CVE-2019-13161

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