On Linux Mint 20.1 Ulyssa, I have received a security update to patch tow security flaws leading to a local privilege escalation without password for all unpatched sudo version before
1.9.5 version and here is a part of the change log:
sudo (1.8.31-1ubuntu1.2) focal-security; urgency=medium * SECURITY UPDATE: dir existence issue via sudoedit race - debian/patches/CVE-2021-23239.patch: fix potential directory existing info leak in sudoedit in src/sudo_edit.c. - CVE-2021-23239 * SECURITY UPDATE: heap-based buffer overflow - debian/patches/CVE-2021-3156-pre1.patch: sanity check size when converting the first record to TS_LOCKEXCL in plugins/sudoers/timestamp.c. - debian/patches/CVE-2021-3156-1.patch: reset valid_flags to MODE_NONINTERACTIVE for sudoedit in src/parse_args.c. - debian/patches/CVE-2021-3156-2.patch: add sudoedit flag checks in plugin in plugins/sudoers/policy.c. - debian/patches/CVE-2021-3156-3.patch: fix potential buffer overflow when unescaping backslashes in plugins/sudoers/sudoers.c. - debian/patches/CVE-2021-3156-4.patch: fix the memset offset when converting a v1 timestamp to TS_LOCKEXCL in plugins/sudoers/timestamp.c. - debian/patches/CVE-2021-3156-5.patch: don't assume that argv is allocated as a single flat buffer in src/parse_args.c. - CVE-2021-3156 -- Marc Deslauriers <firstname.lastname@example.org> Tue, 19 Jan 2021 09:21:02 -0500
But on debian Buster I have received only one update for
sudo --version :
but on linux mint:
sudo --version :
Successful exploitation of this vulnerability allows any unprivileged user to gain root privileges on the vulnerable host. Qualys security researchers have been able to independently verify the vulnerability and develop multiple variants of exploit and obtain full root privileges on Ubuntu 20.04 (Sudo 1.8.31), Debian 10 (Sudo 1.8.27), and Fedora 33 (Sudo 1.9.2). Other operating systems and distributions are also likely to be exploitable.
Until a security update will be uploaded, is there any way to harden debian to avoid exploiting the 2 security flaws CVE-2021-23239 and CVE-2021-3156?