iTerm2, up to and including version 3.3.5, with tmux integration is vulnerable to remote command execution
CVE-2019-9535

9.8CRITICAL

Key Information:

Vendor

Iterm2

Status
Iterm2
Vendor
CVE Published:
9 October 2019

What is CVE-2019-9535?

A vulnerability exists in the way that iTerm2 integrates with tmux's control mode, which may allow an attacker to execute arbitrary commands by providing malicious output to the terminal. This affects versions of iTerm2 up to and including 3.3.5. This vulnerability may allow an attacker to execute arbitrary commands on their victim's computer by providing malicious output to the terminal. It could be exploited using command-line utilities that print attacker-controlled content.

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Affected Version(s)

iTerm2 3.3.5

References

https://kb.cert.org/vuls/id/763073/
third-party-advisoryx_refsource_CERT-VN
https://blog.mozilla.org/security/2019/10/09/iterm2-criti...
x_refsource_MISC
https://groups.google.com/forum/#%21topic/iterm2-discuss/...
x_refsource_CONFIRM

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks to Stefan Grönke and Fabian Freyer of Radically Open Security for finding this vulnerability, the Mozilla Open Source Support (MOSS) project for supporting the audit, and George Nachman of iTerm2 for developing the fix, and all parties for coordinating this vulnerability.
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