#VU109473 Information disclosure in Emacs - CVE-2017-1000383

Vulnerability identifier: #VU109473

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-1000383

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Emacs
Client/Desktop applications / Office applications

Vendor: GNU

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to GNU Emacs ignores umask when creating a backup save file ("[ORIGINAL_FILENAME]~") resulting in files that may be world readable or otherwise accessible in ways not intended by the user running the emacs binary. A local user can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Emacs: 25.3.1

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External links
https://www.openwall.com/lists/oss-security/2017/10/31/1
https://www.securityfocus.com/bid/101671

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.