CVE-2020-28327
First published: Fri Nov 06 2020(Updated: )
A res_pjsip_session crash was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1. and Certified Asterisk before 16.8-cert5. Upon receiving a new SIP Invite, Asterisk did not return the created dialog locked or referenced. This caused a gap between the creation of the dialog object, and its next use by the thread that created it. Depending on some off-nominal circumstances and timing, it was possible for another thread to free said dialog in this gap. Asterisk could then crash when the dialog object, or any of its dependent objects, were dereferenced or accessed next by the initial-creation thread. Note, however, that this crash can only occur when using a connection-oriented protocol (e.g., TCP or TLS, but not UDP) for SIP transport. Also, the remote client must be authenticated, or Asterisk must be configured for anonymous calling.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Asterisk Open Source | >=13.0.0<13.37.1 | |
| Asterisk Open Source | >=16.0.0<16.14.1 | |
| Asterisk Open Source | >=17.0.0<17.8.1 | |
| Asterisk Open Source | >=18.0.0<18.0.1 | |
| Digium Certified Asterisk | =16.8 | |
| Digium Certified Asterisk | =16.8-cert1-rc1 | |
| Digium Certified Asterisk | =16.8-cert1-rc2 | |
| Digium Certified Asterisk | =16.8-cert1-rc3 | |
| Digium Certified Asterisk | =16.8-cert1-rc4 | |
| Digium Certified Asterisk | =16.8-cert2 | |
| Digium Certified Asterisk | =16.8-cert3 | |
| Digium Certified Asterisk | =16.8-cert4 | |
| Digium Certified Asterisk | =16.8-cert4-rc1 | |
| Digium Certified Asterisk | =16.8-cert4-rc2 | |
| Digium Certified Asterisk | =16.8-cert4-rc3 | |
| Digium Certified Asterisk | =16.8-cert4-rc4 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-28327?
CVE-2020-28327 is a vulnerability in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1, as well as Certified Asterisk before 16.8-cert5, that can cause a res_pjsip_session crash.
How severe is CVE-2020-28327?
CVE-2020-28327 has a severity rating of 5.3 (Medium).
How does CVE-2020-28327 affect Asterisk Open Source?
CVE-2020-28327 affects Asterisk Open Source versions 13.x, 16.x, 17.x, and 18.x before the respective patched versions.
How does CVE-2020-28327 affect Certified Asterisk?
CVE-2020-28327 affects Certified Asterisk version 16.8-cert5 and earlier.
Where can I find more information about CVE-2020-28327?
More information about CVE-2020-28327 can be found on the official Asterisk security advisory page (http://downloads.asterisk.org/pub/security/AST-2020-001.html) and the Asterisk issue tracker (https://issues.asterisk.org/jira/browse/ASTERISK-29057).
- agent/author
- agent/description
- agent/first-publish-date
- agent/last-modified-date
- agent/references
- agent/remedy
- agent/severity
- agent/softwarecombine
- agent/weakness
- collector/nvd-index
- vendor/asterisk
- canonical/asterisk open source
- version/asterisk open source/13.0.0
- version/asterisk open source/16.0.0
- version/asterisk open source/17.0.0
- version/asterisk open source/18.0.0
- vendor/digium
- canonical/digium certified asterisk
- version/digium certified asterisk/16.8
- version/digium certified asterisk/16.8-cert1-rc1
- version/digium certified asterisk/16.8-cert1-rc2
- version/digium certified asterisk/16.8-cert1-rc3
- version/digium certified asterisk/16.8-cert1-rc4
- version/digium certified asterisk/16.8-cert2
- version/digium certified asterisk/16.8-cert3
- version/digium certified asterisk/16.8-cert4
- version/digium certified asterisk/16.8-cert4-rc1
- version/digium certified asterisk/16.8-cert4-rc2
- version/digium certified asterisk/16.8-cert4-rc3
- version/digium certified asterisk/16.8-cert4-rc4