PT-2020-1808 · Wowza · Wowza Streaming Engine

Published 2020-01-29 · Updated 2022-05-03 · CVE-2019-7656

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Wowza Streaming Engine versions 4.8.0 and earlier Wowza Streaming Engine versions 4.7.7 and 4.7.8

Description A privilege escalation issue allows any unprivileged Linux user to escalate privileges to root. The installer sets too relaxed permissions on /usr/local/WowzaStreamingEngine/bin/* core program files. By injecting a payload into one of those files, it will run with the same privileges as the Wowza server, root. For example, /usr/local/WowzaStreamingEngine/bin/tune.sh could be replaced with a Trojan horse.

Recommendations For Wowza Streaming Engine versions 4.8.0 and earlier, update to version 4.8.5 or later to resolve the issue. For Wowza Streaming Engine versions 4.7.7 and 4.7.8, update to version 4.8.5 or later to resolve the issue. As a temporary workaround, consider restricting access to the /usr/local/WowzaStreamingEngine/bin/ directory to prevent exploitation.

Exploit

Fix

Incorrect Default Permissions

Incorrect Permission

Weakness Enumeration

CWE-276

CWE-732

Related Identifiers

BDU:2020-01069

CVE-2019-7656

Affected Products

Wowza Streaming Engine

References · 9

• 🔥 https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2019-7656-PrivEscal-Wowza · Exploit
• https://wowza.com/pricing/installer · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-7656 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-01069 · Security Note
• https://wowza.com/docs/wowza-streaming-engine-4-8-5-release-notes · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-7656 · Security Note
• https://t.me/cvenotify/29624 · Telegram Post
• https://t.me/cvenotify/593 · Telegram Post
• https://raw.githubusercontent.com/WowzaMediaSystems/public_cve/main/wowza-streaming-engine/CVE-2019-7656.txt · Note