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Fencer Intel
high 7.8

CVE-2020-15396 json

In HylaFAX+ through 7.0.2 and HylaFAX Enterprise, the faxsetup utility calls chown on files in user-owned directories.

published 6y ago modified 4mo ago also EUVD-2020-7390

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

In HylaFAX+ through 7.0.2 and HylaFAX Enterprise, the faxsetup utility calls chown on files in user-owned directories. By winning a race, a local attacker could use this to escalate his privileges to root.

Patch / fix

  • hylafax Debian 14, Debian 13, Debian 12 3:6.0.7-3.1

debian advisories DEBIAN-CVE-2020-15396

  • hylafax+ openSUSE Tumbleweed 7.0.3-5.1
  • hylafax+ Package Hub 15 SP2 7.0.3-bp152.3.4.1
  • hylafax+ Package Hub 15 SP1 7.0.3-bp151.6.4.1
  • hylafax+ openSUSE Leap 15.1 7.0.3-lp151.4.6.1
  • hylafax+ openSUSE Leap 15.2 7.0.3-lp152.3.6.1

opensuse advisories openSUSE-SU-2024:10852-1openSUSE-SU-2020:1438-1openSUSE-SU-2020:1231-1openSUSE-SU-2020:1210-1openSUSE-SU-2020:1209-1

  • hylafaxplus Alpine 3.10 7.0.0-r4
  • hylafaxplus Alpine 3.11 7.0.1-r2
  • hylafaxplus Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 7.0.2-r2
  • hylafaxplus Alpine 3.9 7.0.0-r1

alpine advisories ALPINE-CVE-2020-15396

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-15396 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-15396 updated cvss 7.0

hylafax+: race condition in faxsetup utility could lead to privileges escalation

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.suse.com https://bugzilla.suse.com/show_bug.cgi?id=1173521 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.