CVE-2020-8793: canonical ubuntu_linux
CVSS: 4.7v3.1MediumModified
AliasesUBUNTU-CVE-2020-8793DEBIAN-CVE-2020-8793
Published 25-02-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-8793 is a medium (CVSS 4.7) vulnerability in canonical ubuntu_linux. EPSS estimates a 0.90% chance of exploitation in the next 30 days, higher than 58.9% of scored vulnerabilities. 2 public exploits are recorded.
CVSS score
4.7/10
010
Medium · v3.1 (NVD)EPSS score
0.90%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2reference, exploit-database
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 25-02-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
OpenSMTPD before 6.6.4 allows local users to read arbitrary files (e.g., on some Linux distributions) because of a combination of an untrusted search path in makemap.c and race conditions in the offline functionality in smtpd.c.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 4.7Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated4.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated4.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Medium 4.7Preferred score · NVD (NIST)
AV:L/AC:M/Au:N/C:C/I:N/A:NSourcesSingle source
EPSS trend
Probability
0.90%
Chance of exploitation in the next 30 days
Percentile
59%
Versus all other CVEs
30-day change
0.00 pp
From 0.90% on 19-09-2026
19-09-202619-10-2026
EPSS score0.90%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (openwall.com)
Maturity: unknown
OpenSMTPD 6.6.3 - Arbitrary File Read
Maturity: poc
Weaknesses
CWE · root cause- CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionThe product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
- CWE-426Untrusted Search PathThe product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control.
Affected systems
Canonical1 product
- ubuntu_linuxEOL18.04 | 19.10
Debian1 product
- opensmtpd< 6.6.4p1-1
Fedoraproject1 product
- fedoraEOL32
Opensmtpd1 product
- opensmtpd< 6.6.4
Ubuntu1 product
- opensmtpdAll versions (No fix recorded) | < 5.7.3p2-1ubuntu0.1~esm2 | < 6.0.3p1-1ubuntu0.2 | < 6.6.4p1-1
5 vendors · 5 products
References
10 links- www.openwall.com/lists/oss-security/2020/02/24/4Mailing ListX Refsource MLISTExploitThird Party Advisory
