[ASA-202107-35] dino: directory traversal

2021-07-20T00:00:00
ID ASA-202107-35
Type archlinux
Reporter ArchLinux
Modified 2021-07-20T00:00:00

Description

Arch Linux Security Advisory ASA-202107-35

Severity: Medium Date : 2021-07-20 CVE-ID : CVE-2021-33896 Package : dino Type : directory traversal Remote : Yes Link : https://security.archlinux.org/AVG-2043

Summary

The package dino before version 0.2.1-1 is vulnerable to directory traversal.

Resolution

Upgrade to 0.2.1-1.

pacman -Syu "dino>=0.2.1-1"

The problem has been fixed upstream in version 0.2.1.

Workaround

None.

Description

It was discovered that when a user receives and downloads a file in Dino before version 0.2.1, URI-encoded path separators in the file name will be decoded, allowing an attacker to traverse directories and create arbitrary files in the context of the user.

This vulnerability does not allow to overwrite or modify existing files and the attacker cannot control the executable flag of created files. However, third-party software may be affected by newly created configuration files, potentially allowing for code execution.

The file name, including path separators, is displayed to the user, however, long file names are ellipsized in the middle of the file name, allowing the attacker to hide the malicious path separators, as long as the resulting file name has sufficient length.

Impact

A remote attacker could create files in arbitrary locations in the context of the user by tricking the user into downloading a file with a crafted file name.

References

https://dino.im/security/cve-2021-33896/ https://github.com/dino/dino/commit/1eaad1ccfbd00c6e76650535496531c172453994 https://security.archlinux.org/CVE-2021-33896