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CVE-2013-4235· NVD / CVE Program· CNA redhat

shadow: TOCTOU (time-of-check time-of-use) race condition when copying and removing directory trees

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.30% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: shadow (Debian:12) 1:4.12.3+dfsg1-1; shadow (openSUSE:Tumbleweed) 4.11.1-1.1; shadow (SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS) 4.8.1-150300.4.15.1.

Low priority for now. Upgrade to shadow (Debian:12) 1:4.12.3+dfsg1-1; shadow (openSUSE:Tumbleweed) 4.11.1-1.1; shadow (SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS) 4.8.1-150300.4.15.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Dec 3, 2019
Updated
Oct 14, 2026
EPSS
0.3% · 21th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
debianshadow
debiandebian linux
fedoraprojectfedora
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux8.0
  • debian debian linux9.0
  • debian shadowall versions
  • fedoraproject fedora16
  • fedoraproject fedora17
  • redhat enterprise linux5
  • redhat enterprise linux6.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • shadow shadow

    • 1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12shadowbefore 1:4.12.3+dfsg1-11:4.12.3+dfsg1-1
openSUSE:Tumbleweedshadowbefore 4.11.1-1.14.11.1-1.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSshadowbefore 4.8.1-150300.4.15.14.8.1-150300.4.15.1
SUSE:Linux Enterprise Micro 5.1shadowbefore 4.8.1-150300.4.18.14.8.1-150300.4.18.1
SUSE:Linux Enterprise Micro 5.3shadowbefore 4.8.1-150400.10.18.14.8.1-150400.10.18.1
SUSE:Linux Enterprise Micro 5.3shadowbefore 4.8.1-150400.10.18.14.8.1-150400.10.18.1
SUSE:Linux Enterprise Micro 5.3shadowbefore 4.8.1-150400.10.21.14.8.1-150400.10.21.1
SUSE:Linux Enterprise Micro 5.3shadowbefore 4.8.1-150400.10.21.14.8.1-150400.10.21.1
SUSE:Linux Enterprise Micro 5.4shadowbefore 4.8.1-150400.3.9.14.8.1-150400.3.9.1
SUSE:Linux Enterprise Micro 5.4shadowbefore 4.8.1-150400.3.12.14.8.1-150400.3.12.1
SUSE:Linux Enterprise Micro 5.5shadowbefore 4.8.1-150500.3.6.14.8.1-150500.3.6.1
SUSE:Linux Enterprise Micro 5.5shadowbefore 4.8.1-150500.3.9.14.8.1-150500.3.9.1
SUSE:Linux Enterprise Micro 5.5shadowbefore 4.8.1-150500.3.9.14.8.1-150500.3.9.1
SUSE:Linux Enterprise Micro 5.5shadowbefore 4.8.1-150500.3.6.14.8.1-150500.3.6.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6shadowbefore 4.8.1-150600.17.3.14.8.1-150600.17.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6shadowbefore 4.8.1-150600.17.6.14.8.1-150600.17.6.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6shadowbefore 4.8.1-150600.17.6.14.8.1-150600.17.6.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6shadowbefore 4.8.1-150600.17.3.14.8.1-150600.17.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7shadowbefore 4.17.2-150600.17.18.14.17.2-150600.17.18.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7shadowbefore 4.17.2-150600.17.18.14.17.2-150600.17.18.1
SUSE:Linux Enterprise Server 12 SP5shadowbefore 4.2.1-36.15.14.2.1-36.15.1
SUSE:Linux Enterprise Server 12 SP5shadowbefore 4.2.1-36.12.14.2.1-36.12.1

Same product

debian: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-20002The Debian shadow package before 1:4.5-1 for Shadow incorrectly lists pts/0 and pts/1 as physical terminals in /etc/securetty.
    31Monitor
  • CVE-2005-4890There is a possible tty hijacking in shadow 4.x before 4.1.5 and sudo 1.x before 1.7.4 via "su - user -c program".
    31Monitor
  • CVE-2008-5394/bin/login in shadow 4.0.18.1 in Debian GNU/Linux, and probably other Linux distributions, allows local users in the utmp group to overwrite
    28Monitor
  • CVE-2011-0721Multiple CRLF injection vulnerabilities in (1) chfn and (2) chsh in shadow 1:4.1.4 allow local users to add new users or groups to /etc/pass
    26Monitor
  • CVE-2004-1001Unknown vulnerability in the passwd_check function in Shadow 4.0.4.1, and possibly other versions before 4.0.5, allows local users to conduc
    18Monitor
  • CVE-2006-1174useradd in shadow-utils before 4.0.3, and possibly other versions before 4.0.8, does not provide a required argument to the open function wh
    14Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:shadow1:4.12.3+dfsg1-1 · Debian:12Package registry (OSV)
opensuse:shadow4.17.2-150600.17.18.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:shadow4.17.2-150600.17.18.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records