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CVE-2015-8370

Status Candidate

Overview

Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.

Related Files

Gentoo Linux Security Advisory 201512-03
Posted Dec 20, 2015
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201512-3 - GRUB's authentication prompt can be bypassed by entering a sequence of backspace characters. Versions less than 2.02_beta2-r8 are affected.

tags | advisory
systems | linux, gentoo
advisories | CVE-2015-8370
MD5 | 43576b322118f4c3072103d53e3559cf
Slackware Security Advisory - grub Updates
Posted Dec 18, 2015
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New grub packages are available for Slackware 14.1 and -current to fix a security issue.

tags | advisory
systems | linux, slackware
advisories | CVE-2015-8370
MD5 | e1fe8dc867f607df7a542486554d4972
Debian Security Advisory 3421-1
Posted Dec 17, 2015
Authored by Debian | Site debian.org

Debian Linux Security Advisory 3421-1 - Hector Marco and Ismael Ripoll, from Cybersecurity UPV Research Group, found an integer underflow vulnerability in Grub2, a popular bootloader. A local attacker can bypass the Grub2 authentication by inserting a crafted input as username or password.

tags | advisory, local
systems | linux, debian
advisories | CVE-2015-8370
MD5 | d49960cfd64798c49441e802e33928d2
Ubuntu Security Notice USN-2836-1
Posted Dec 16, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2836-1 - Hector Marco and Ismael Ripoll discovered that GRUB incorrectly handled the backspace key when configured to use authentication. A local attacker could use this issue to bypass GRUB password protection.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2015-8370
MD5 | a3373df9f8c8ce5155c5e59dd0e91264
Red Hat Security Advisory 2015-2623-01
Posted Dec 15, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-2623-01 - The grub2 packages provide version 2 of the Grand Unified Bootloader, a highly configurable and customizable bootloader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. A flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2015-8370
MD5 | 9604a662b367029b69b77e2601a288e3
Grub2 Authentication Bypass
Posted Dec 15, 2015
Authored by Hector Marco, Ismael Ripoll

Grub2 versions 1.98 through 2.02 suffer from an authentication bypass vulnerability.

tags | advisory, bypass
advisories | CVE-2015-8370
MD5 | 4a7220946b6587ecac77303f9f1f7496
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