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CVE-2008-4956

22
FAUCET Score

CVE-2008-4956 describes a symlink attack vulnerability in the fwb_install component of Firewall Builder (fwbuilder) version 2.1.19. A local attacker can exploit this by creating a symbolic link to an arbitrary file, allowing them to overwrite that file when fwbuilder attempts to create a temporary file named /tmp/ssh-agent.#####. This vulnerability has a CVSS score of 6.9, indicating high severity due to its local attack vector, medium complexity, and complete impact on confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this decade-old vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
2.1.19CPE matchmatch criteria
cpe:2.3:a:firewallbuilder:fwbuilder:2.1.19:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.9MEDIUM

AV:L/AC:M/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
3.4
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.41%
Probability of exploitation in next 30 days
EPSS Percentile
33.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0041 is in the 61st percentile among its peer group of 1,595 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2008-4956Moderate

fwbuilder: temporary file vulnerability

Oct 30, 2008

References

bugs.debian.org / 496406
dev.gentoo.org / ~rbu/security/debiantemp/fwbuilder
Exploit
bugs.gentoo.org / show_bug.cgi
bugs.gentoo.org / show_bug.cgi
openwall.com / lists/oss-security/2008/10/30/2