A flaw was found in GNU nano's multi-buffer error message handling. When a user opens multiple files at startup and one triggers an ALERT-level error, a specially crafted filename containing printf format specifiers can be reinterpreted. This format string vulnerability may allow an attacker to achieve stack information disclosure, cause a denial of service (crash), or potentially perform arbitrary memory writes.

A vulnerability was found in GNU Nano that allows a possible privilege escalation through an insecure temporary file. If Nano is killed while editing, a file it saves to an emergency file with the permissions of the running user provides a window of opportunity for attackers to escalate privileges through a malicious symlink.

A flaw was found in nano. A local user could exploit a format string vulnerability in the statusline() function. By creating a directory with a name containing printf specifiers, the application attempts to display this name, leading to a segmentation fault (SEGV). This results in a Denial of Service (DoS) for the nano application.

Format string vulnerability in nano's statusline(). Directory names containing printf specifiers (%s) are stored in errormessage and later passed as format string to statusline() with no args. Causes stack reads and SEGV.

Verified on nano 8.7 with ASAN. BZ#2455127. Reported by Michał Majchrowicz and Marcin Wyczechowski, AFINE Team.

A flaw was found in GNU nano's multi-buffer error message handling. When a user opens multiple files at startup and one triggers an ALERT-level error, a specially crafted filename containing printf format specifiers can be reinterpreted. This format string vulnerability may allow an attacker to achieve stack information disclosure, cause a denial of service (crash), or potentially perform arbitrary memory writes.

Race condition in GNU nano before 2.2.4, when run by root to edit a file that is not owned by root, allows local user-assisted attackers to change the ownership of arbitrary files via vectors related to the creation of backup files.

A flaw was found in nano. In environments with permissive umask settings, a local attacker can exploit incorrect directory permissions (0777 instead of 0700) for the ~/.local directory. This allows the attacker to inject a malicious .desktop launcher, which could lead to unintended actions or information disclosure if the launcher is subsequently processed.

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

GNU nano before 2.2.4 does not verify whether a file has been changed before it is overwritten in a file-save operation, which allows local user-assisted attackers to overwrite arbitrary files via a symlink attack on an attacker-owned file that is being edited by the victim.

nano creates ~/.local with mode 0777 instead of 0700. In permissive-umask environments (containers, CI), local attacker can race to inject malicious .desktop launcher. The subsequent mkdir for ~/.local/share correctly uses 0700.

Affected: src/history.c lines 229-234. BZ#2455314. Reported by Michał Majchrowicz and Marcin Wyczechowski, AFINE Team.