tmux stack buffer overflow in function input_csi_dispatch_sgr_colon
CVE-2020-27347

8.8HIGH

Key Information:

Vendor

Tmux

Status
Tmux
Vendor
CVE Published:
6 November 2020

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-27347?

In tmux before version 3.1c the function input_csi_dispatch_sgr_colon() in file input.c contained a stack-based buffer-overflow that can be exploited by terminal output.

Affected Version(s)

tmux < 3.1c

tmux 3.1b < 3.1b-1ubuntu0.1

tmux 3.0a < 3.0a-2ubuntu0.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

tmux-fuzzing
Created by lucadibello

References

https://github.com/tmux/tmux/commit/a868bacb46e3c900530be...
x_refsource_MISC
https://www.openwall.com/lists/oss-security/2020/11/05/3
x_refsource_MISC
https://security.gentoo.org/glsa/202011-10
vendor-advisoryx_refsource_GENTOO

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sergey Nizovtsev
.