PT-2021-21886 · Pengutronix · Barebox

Published 2021-08-02 · Updated 2021-09-21 · CVE-2021-37847

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Pengutronix barebox versions through 2021.07.0

Description: The issue is related to the crypto/digest.c file in Pengutronix barebox, where the use of memcmp during digest verification leaks timing information.

Recommendations: For versions through 2021.07.0, consider updating to a version later than 2021.07.0 to resolve the issue. As a temporary workaround, consider modifying the crypto/digest.c file to use a constant-time comparison function instead of memcmp until a patch is available.

Exploit

Fix

Related Identifiers

CVE-2021-37847

Affected Products

Barebox

References · 7

• 🔥 https://gist.github.com/gquere/816dfadbad98745090034100a8a651eb · Exploit
• https://osv.dev/vulnerability/CVE-2021-37847 · Vendor Advisory
• https://github.com/saschahauer/barebox/commit/0a9f9a7410681e55362f8311537ebc7be9ad0fbe · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-37847 · Security Note
• https://t.me/cvenotify/20386 · Telegram Post
• https://t.me/cibsecurity/26712 · Telegram Post
• https://t.me/cvenotify/18507 · Telegram Post