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AUSCERT External Security Bulletin Redistribution
ESB-2023.2761
USN-6076-1: Synapse vulnerabilities
17 May 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Synapse
Publisher: Ubuntu
Operating System: Ubuntu
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18835 CVE-2019-11842 CVE-2019-5885
CVE-2018-16515 CVE-2018-12423 CVE-2018-12291
CVE-2018-10657
Original Bulletin:
https://ubuntu.com/security/notices/USN-6076-1
Comment: CVSS (Max): 9.8 CVE-2019-18835 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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USN-6076-1: Synapse vulnerabilities
16 May 2023
Several security issues were fixed in Synapse.
Releases
o Ubuntu 18.04 ESM
Packages
o matrix-synapse - Synapse: Matrix homeserver written in Python/Twisted.
Details
It was discovered that Synapse incorrectly handled certain inputs. If a
user or an automated system were tricked into opening a specially crafted
input file, a remote attacker could possibly use this issue to cause a
denial of service. ( CVE-2019-18835 , CVE-2018-12291 , CVE-2018-10657 )
It was discovered that Synapse incorrectly handled certain inputs. If a
user or an automated system were tricked into opening a specially crafted
input file, a remote attacker could possibly use this issue to hijack the
session. ( CVE-2019-11842 , CVE-2018-12423 )
It was discovered that Synapse incorrectly handled certain inputs. If a
user or an automated system were tricked into opening a specially crafted
input file, a remote attacker could possibly use this issue to perform
spoofing or user impersonation. ( CVE-2019-5885 , CVE-2018-16515 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o matrix-synapse - 0.24.0+dfsg-1ubuntu0.1~esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References
o CVE-2019-5885
o CVE-2018-12291
o CVE-2018-16515
o CVE-2018-12423
o CVE-2019-11842
o CVE-2018-10657
o CVE-2019-18835
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