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CVE-2019-13161

MEDIUMCVSS 5.3/10EPSS 4.03%

Last modified

CVE-2019-13161 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 4.03% chance of exploitation in the next 30 days.

Description

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).

Metrics

CVSS 3.1
5.3/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
4.03%

89.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
DigiumCertified Asterisk1.8.0.0—
DigiumCertified Asterisk1.8.1.0—
DigiumCertified Asterisk1.8.2.0—
DigiumCertified Asterisk1.8.3.0—
DigiumCertified Asterisk1.8.4.0—
DigiumCertified Asterisk1.8.5.0—
DigiumCertified Asterisk1.8.6.0—
DigiumCertified Asterisk1.8.7.0—
DigiumCertified Asterisk1.8.8.0—
DigiumCertified Asterisk1.8.9.0—
DigiumCertified Asterisk1.8.10.0—
DigiumCertified Asterisk1.8.11Cert
DigiumCertified Asterisk1.8.11.0—
DigiumCertified Asterisk1.8.12.0—
DigiumCertified Asterisk1.8.13.0—
DigiumCertified Asterisk1.8.14.0Rc1
DigiumCertified Asterisk1.8.15—
DigiumCertified Asterisk1.8.28—
DigiumCertified Asterisk1.8.28.0—
DigiumCertified Asterisk11.0.0—
DigiumCertified Asterisk11.1.0—
DigiumCertified Asterisk11.2Cert1
DigiumCertified Asterisk11.3.0—
DigiumCertified Asterisk11.4.0—
DigiumCertified Asterisk11.5.0—
DigiumCertified Asterisk11.6Cert1
DigiumCertified Asterisk11.6.0—
DigiumCertified Asterisk13.1Cert1
DigiumCertified Asterisk13.1.0—
DigiumCertified Asterisk13.8Cert1
DigiumCertified Asterisk13.8.0—
DigiumCertified Asterisk13.13Cert1-Rc1
DigiumCertified Asterisk13.13-cert2—
DigiumCertified Asterisk13.18Cert1
DigiumCertified Asterisk13.21Cert1
DigiumAsterisk>= 13.0.0, < 13.27.1—
DigiumAsterisk>= 15.0.0, < 15.7.3—
DigiumAsterisk>= 16.0.0, < 16.4.1—
DebianDebian Linux8.0—
DebianDebian Linux9.0—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-13161?
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).
How severe is CVE-2019-13161?
CVE-2019-13161 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 4.03% probability of exploitation in the next 30 days.
How do I fix CVE-2019-13161?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-13161?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST