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Firefox CVE-2014-8639

MEDIUM
2015-01-14 security@mozilla.org
Information Disclosure Mozilla Firefox Seamonkey Thunderbird Firefox Esr
6.8
CVSS 2.0 · NVD
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Vulnerability Assessment

Impact

CVSS score of 6.8 (MEDIUM). Attack characteristics: network attack vector, M complexity. EPSS exploitation probability: 1.84%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 1.8% exploitation probability (EPSS)

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AnalysisAI

Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thunderbird before 31.4, and SeaMonkey before 2.32 do not properly interpret Set-Cookie headers within responses that have a 407 (aka Proxy. Rated medium severity (CVSS 6.8), this vulnerability is remotely exploitable. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thunderbird before 31.4, and SeaMonkey before 2.32 do not properly interpret Set-Cookie headers within responses that have a 407 (aka Proxy Authentication Required) status code, which allows remote HTTP proxy servers to conduct session fixation attacks by providing a cookie name that corresponds to the session cookie of the origin server. Affected products include: Mozilla Seamonkey, Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird. Version information: before 35.0.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 6.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
M
Confidentiality
P
Integrity
P
Availability
P

DescriptionCVE.org

Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thunderbird before 31.4, and SeaMonkey before 2.32 do not properly interpret Set-Cookie headers within responses that have a 407 (aka Proxy Authentication Required) status code, which allows remote HTTP proxy servers to conduct session fixation attacks by providing a cookie name that corresponds to the session cookie of the origin server.

Threat Intelligence Overview

EPSS Score
1.8%
Top 17% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 1.8%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.3.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

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References

Advisories & patches
ADVISORY http://www.mozilla.org/security/announce/2014/mfsa2015-04.html REF http://linux.oracle.com/errata/ELSA-2015-0046.html REF http://linux.oracle.com/errata/ELSA-2015-0047.html REF http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00014.html REF http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00032.html REF http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00033.html REF http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00036.html REF http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00002.html REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html REF http://lists.opensuse.org/opensuse-updates/2015-01/msg00071.html REF http://rhn.redhat.com/errata/RHSA-2015-0046.html REF http://rhn.redhat.com/errata/RHSA-2015-0047.html REF http://secunia.com/advisories/62237 REF http://secunia.com/advisories/62242 REF http://secunia.com/advisories/62250 REF http://secunia.com/advisories/62253 REF http://secunia.com/advisories/62259 REF http://secunia.com/advisories/62273 REF http://secunia.com/advisories/62274 REF http://secunia.com/advisories/62283 REF http://secunia.com/advisories/62293 REF http://secunia.com/advisories/62304 REF http://secunia.com/advisories/62313 REF http://secunia.com/advisories/62315 REF http://secunia.com/advisories/62316 REF http://secunia.com/advisories/62418 REF http://secunia.com/advisories/62446 REF http://secunia.com/advisories/62657 REF http://secunia.com/advisories/62790 REF http://www.debian.org/security/2015/dsa-3127 REF http://www.debian.org/security/2015/dsa-3132 REF http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html REF http://www.securityfocus.com/bid/72046 REF http://www.securitytracker.com/id/1031533 REF http://www.securitytracker.com/id/1031534 REF http://www.ubuntu.com/usn/USN-2460-1 REF https://bugzilla.mozilla.org/show_bug.cgi?id=1095859 REF https://exchange.xforce.ibmcloud.com/vulnerabilities/99959 REF https://security.gentoo.org/glsa/201504-01

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