CVE-2020-7040

storeBackup.pl in storeBackup through 3.5 relies on the /tmp/storeBackup.lock pathname, which allows symlink attacks that possibly lead to privilege escalation. (Local users can also create a plain file named /tmp/storeBackup.lock to block use of storeBackup until an admin manually deletes that file.)

Published: 2020-01-21 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-7040 is rated Moderate Risk (63.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 5.19%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-7040

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-28 5.46% 5.19% -0.26%
2 2025-12-27 5.19% 5.46% +0.26%
3 2025-11-21 — 5.19% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-7040

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 5.9 [email protected]
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2020-7040

OS Trackers for CVE-2020-7040

vendor priority summary link
debian not yet assigned CVE-2020-7040 not yet assigned priority: Debian including 1 source packages (storebackup), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2020-7040
ubuntu medium CVE-2020-7040 medium priority: Ubuntu including 1 source packages (storebackup), 7 status rows across 7 suites (bionic, disco, eoan, focal, trusty, upstream, xenial): released 3, ignored 2, DNE 1, needed 1. https://ubuntu.com/security/CVE-2020-7040

Affected software / configurations for CVE-2020-7040

Vendor Product Version Raw CPE
storebackup storebackup <= 3.5 cpe:2.3:a:storebackup:storebackup:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
opensuse backports_sle 15.0 cpe:2.3:a:opensuse:backports_sle:15.0:*:*:*:*:*:*:*
opensuse backports_sle 15.0 cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 20.04 cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*

References for CVE-2020-7040

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00054.html Mailing List Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/3 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/21/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/22/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/22/3 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/23/1 Mailing List Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-7040 Issue Tracking Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/02/msg00003.html Mailing List Third Party Advisory
https://seclists.org/oss-sec/2020/q1/20 Mailing List Third Party Advisory
https://usn.ubuntu.com/4508-1/ Third Party Advisory
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