XScreenSaver 4.10, when using a remote directory service for credentials, does not properly handle the results from the getpwuid function in
XScreenSaver 4.10, when using a remote directory service for credentials, does not properly handle the results from the getpwuid function in drivers/lock.c when there is no network connectivity, which causes XScreenSaver to crash and unlock the screen and allows local users to bypass authentication.
- Published
- May 2, 2007
- Updated
- Jun 16, 2026
- EPSS
- 0.4% · 33th percentile
- CWE
- CWE-287
Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.
Report tools
Action score
18
Monitor
Low priority for now.
- CVSS
- 18 / 40 · 4.6 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| xscreensaver | xscreensaver | cpe:2.3:a:xscreensaver:xscreensaver |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | linux advanced workstation | cpe:2.3:o:redhat:linux_advanced_workstation |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- xscreensaver xscreensaver4.10
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | xscreensaver | before 5.03-1 | 5.03-1 |
| Red Hat:enterprise_linux:2.1::as | xscreensaver | before 1:3.33-4.rhel21.5 | 1:3.33-4.rhel21.5 |
| Red Hat:enterprise_linux:3::as | xscreensaver | before 1:4.10-21.el3 | 1:4.10-21.el3 |
| Red Hat:enterprise_linux:3::as | xscreensaver-debuginfo | before 1:4.10-21.el3 | 1:4.10-21.el3 |
| Red Hat:enterprise_linux:4::as | xscreensaver | before 1:4.18-5.rhel4.14 | 1:4.18-5.rhel4.14 |
| Red Hat:enterprise_linux:4::as | xscreensaver-debuginfo | before 1:4.18-5.rhel4.14 | 1:4.18-5.rhel4.14 |
Same product
xscreensaver: all recordsOther highest-scoring records for the same primary product.
- CVE-2003-0885Xscreensaver 4.14 contains certain debugging code that should have been omitted, which causes Xscreensaver to create temporary files insecur25Monitor
- CVE-2004-2655rdesktop 1.3.1 with xscreensaver 4.14, and possibly other versions, when running on Fedora and possibly other platforms, does not release th22Monitor
- CVE-2007-5585xscreensaver 5.03 and earlier, when running without xscreensaver-gl-extras (GL extras) installed, crashes when /usr/bin/xscreensaver-gl-help21Monitor
- CVE-2003-1294Xscreensaver before 4.15 creates temporary files insecurely in (1) driver/passwd-kerberos.c, (2) driver/xscreensaver-getimage-video, (3) dri8Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:xscreensaver | 5.03-1 · Debian:12 | Package registry (OSV) |
| red hat:xscreensaver | 1:3.33-4.rhel21.5 · Red Hat:enterprise_linux:2.1::as | Package registry (OSV) |
| red hat:xscreensaver-debuginfo | 1:4.10-21.el3 · Red Hat:enterprise_linux:3::as | Package 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.
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 researchersFinders, 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
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- P · data can be read
- Integrity
- P · data or configuration can be modified
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- P
- Integrity impact
- P
- Availability impact
- P
Weakness class (CWE)
CWE-287 · Improper AuthenticationCVSS vector
AV:L/AC:L/Au:N/C:P/I:P/A:P
nvd-primary
Root cause
Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.
The bug in code
The whole CWE-287 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);Fixed
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Authentication AbuseCAPEC-114Medium
- Authentication BypassCAPEC-115Medium
- Identity SpoofingCAPEC-151likelihood: Medium · Medium
- Fake the Source of DataCAPEC-194Medium
- Exploiting Trust in ClientCAPEC-22likelihood: High · High
- Utilizing REST's Trust in the System Resource to Obtain Sensitive DataCAPEC-57likelihood: Medium · Very High
- Session HijackingCAPEC-593likelihood: High · Very High
- Token ImpersonationCAPEC-633Medium
ATT&CK techniques
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- osvdb.org/35531
- secunia.com/advisories/25065
- secunia.com/advisories/25105
- secunia.com/advisories/25116
- secunia.com/advisories/25118
- secunia.com/advisories/25119
- secunia.com/advisories/25225
- secunia.com/advisories/25610
- security.gentoo.org/glsa/glsa-200705-14.xml
- www.mandriva.com/security/advisories?name=MDKSA-2007:097
- www.novell.com/linux/security/advisories/2007_9_sr.html
- www.redhat.com/support/errata/RHSA-2007-0322.html
- www.securityfocus.com/bid/23783
- www.securitytracker.com/id?1017996
- www.ubuntu.com/usn/usn-474-1
- exchange.xforce.ibmcloud.com/vulnerabilities/34054
- issues.rpath.com/browse/RPL-1293
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11459
Vendor advisories and official records. Exploit/PoC links are deliberately left out.