CVE-2020-28327

NameCVE-2020-28327
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs974712

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
asterisk (PTS)jessie, jessie (lts)1:11.13.1~dfsg-2+deb8u8vulnerable
stretch (security)1:13.14.1~dfsg-2+deb9u6vulnerable
stretch (lts), stretch1:13.14.1~dfsg-2+deb9u10vulnerable
buster, buster (lts)1:16.28.0~dfsg-0+deb10u5fixed
buster (security)1:16.28.0~dfsg-0+deb10u4fixed
bullseye1:16.28.0~dfsg-0+deb11u4fixed
bullseye (security)1:16.28.0~dfsg-0+deb11u5fixed
sid1:22.1.0~dfsg+~cs6.14.60671435-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
asterisksourcejessie(unfixed)end-of-life
asterisksource(unstable)1:16.15.0~dfsg-1974712

Notes

[buster] - asterisk <no-dsa> (Minor issue)
[stretch] - asterisk <no-dsa> (Minor issue)
https://issues.asterisk.org/jira/browse/ASTERISK-29057
http://downloads.asterisk.org/pub/security/AST-2020-001.html
https://www.openwall.com/lists/oss-security/2020/11/06/1

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