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Fencer Vulns
medium 6.9

CVE-2009-1893 json

The configtest function in the Red Hat dhcpd init script for DHCP 3.0.1 in Red Hat Enterprise Linux (RHEL) 3 allows local users to overwrit…

published 2009-07-17 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1888

cvss
6.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

The configtest function in the Red Hat dhcpd init script for DHCP 3.0.1 in Red Hat Enterprise Linux (RHEL) 3 allows local users to overwrite arbitrary files via a symlink attack on an unspecified temporary file, related to the "dhcpd -t" command.

Patch / fix

  • dhcp RHEL 3 7:3.0.1-10.2_EL3
  • dhclient RHEL 3 7:3.0.1-10.2_EL3

red hat advisories RHSA-2009:1154

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-2009-1893 updated cvss 5.6

dhcp: insecure temporary file use in the dhcpd init script

  • Red Hat Desktop version 3 dhcp 3.0.1-10.2_EL3, dhclient 3.0.1-10.2_EL3 Red Hat Enterprise Linux AS version 3 dhcp 3.0.1-10.2_EL3, dhclient 3.0.1-10.2_EL3 Red Hat Enterprise Linux ES version 3 dhcp 3.0.1-10.2_EL3, dhclient 3.0.1-10.2_EL3 Red Hat Enterprise Linux WS version 3 dhcp 3.0.1-10.2_EL3, dhclient 3.0.1-10.2_EL3
    fixed: vendor fix RHSA-2009:1154

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

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Vulns 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.