Vulnerability Details : 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.)
Vulnerability category: Gain privilege
Products affected by CVE-2020-7040
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:storebackup:storebackup:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
- cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*
- cpe:2.3:a:opensuse:backports_sle:15.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-7040
0.38%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 73 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-7040
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
9.3
|
HIGH | AV:N/AC:M/Au:N/C:C/I:C/A:C |
8.6
|
10.0
|
NIST | |
|
8.1
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2
|
5.9
|
NIST |
CWE ids for CVE-2020-7040
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-7040
-
https://seclists.org/oss-sec/2020/q1/20
oss-sec: CVE-2020-7040: storeBackup: denial of service and symlink attack vector via fixed lockfile path /tmp/storeBackup.lockMailing List;Third Party Advisory
-
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-7040
Bug 1156767 – VUL-0: CVE-2020-7040: storeBackup: /tmp/storeBackup.lock default lock file location opens up a local DoS attack vectorIssue Tracking;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2020/01/22/3
oss-security - Re: CVE-2020-7040: storeBackup: denial of service and symlink attack vector via fixed lockfile path /tmp/storeBackup.lockMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2020/01/20/3
oss-security - CVE-2020-7040: storeBackup: denial of service and symlink attack vector via fixed lockfile path /tmp/storeBackup.lockMailing List;Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2020/02/msg00003.html
[SECURITY] [DLA 2095-1] storebackup security updateMailing List;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2020/01/23/1
oss-security - Re: CVE-2020-7040: storeBackup: denial of service and symlink attack vector via fixed lockfile path /tmp/storeBackup.lockMailing List;Third Party Advisory
-
https://usn.ubuntu.com/4508-1/
USN-4508-1: StoreBackup vulnerability | Ubuntu security notices | UbuntuThird Party Advisory
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http://www.openwall.com/lists/oss-security/2020/01/22/2
oss-security - Re: CVE-2020-7040: storeBackup: denial of service and symlink attack vector via fixed lockfile path /tmp/storeBackup.lockMailing List;Third Party Advisory
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http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00054.html
[security-announce] openSUSE-SU-2020:0119-1: moderate: Security update fMailing List;Patch;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2020/01/21/2
oss-security - Re: CVE-2020-7040: storeBackup: denial of service and symlink attack vector via fixed lockfile path /tmp/storeBackup.lockMailing List;Third Party Advisory
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