ubuntu-cve-2015-2721
Vulnerability from osv_ubuntu
Published
2015-07-05 00:00
Modified
2026-04-22 07:37
Summary
Details
Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "firefox",
"binary_version": "39.0+build5-0ubuntu0.14.04.1"
},
{
"binary_name": "firefox-globalmenu",
"binary_version": "39.0+build5-0ubuntu0.14.04.1"
},
{
"binary_name": "firefox-mozsymbols",
"binary_version": "39.0+build5-0ubuntu0.14.04.1"
},
{
"binary_name": "firefox-testsuite",
"binary_version": "39.0+build5-0ubuntu0.14.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "firefox",
"purl": "pkg:deb/ubuntu/firefox@39.0+build5-0ubuntu0.14.04.1?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "39.0+build5-0ubuntu0.14.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"24.0+build1-0ubuntu1",
"25.0+build3-0ubuntu0.13.10.1",
"28.0~b2+build1-0ubuntu2",
"28.0+build1-0ubuntu1",
"28.0+build2-0ubuntu1",
"28.0+build2-0ubuntu2",
"29.0+build1-0ubuntu0.14.04.2",
"30.0+build1-0ubuntu0.14.04.3",
"31.0+build1-0ubuntu0.14.04.1",
"32.0+build1-0ubuntu0.14.04.1",
"32.0.3+build1-0ubuntu0.14.04.1",
"33.0+build2-0ubuntu0.14.04.1",
"34.0+build2-0ubuntu0.14.04.1",
"35.0+build3-0ubuntu0.14.04.2",
"35.0.1+build1-0ubuntu0.14.04.1",
"36.0+build2-0ubuntu0.14.04.4",
"36.0.1+build2-0ubuntu0.14.04.1",
"36.0.4+build1-0ubuntu0.14.04.1",
"37.0+build2-0ubuntu0.14.04.1",
"37.0.1+build1-0ubuntu0.14.04.1",
"37.0.2+build1-0ubuntu0.14.04.1",
"38.0+build3-0ubuntu0.14.04.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnss3",
"binary_version": "2:3.19.2-0ubuntu0.14.04.1"
},
{
"binary_name": "libnss3-1d",
"binary_version": "2:3.19.2-0ubuntu0.14.04.1"
},
{
"binary_name": "libnss3-nssdb",
"binary_version": "2:3.19.2-0ubuntu0.14.04.1"
},
{
"binary_name": "libnss3-tools",
"binary_version": "2:3.19.2-0ubuntu0.14.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "nss",
"purl": "pkg:deb/ubuntu/nss@2:3.19.2-0ubuntu0.14.04.1?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:3.19.2-0ubuntu0.14.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:3.15.1-1ubuntu1",
"2:3.15.2-1",
"2:3.15.3-1",
"2:3.15.3.1-1",
"2:3.15.3.1-1.1",
"2:3.15.3.1-1.1ubuntu1",
"2:3.15.4-1ubuntu3",
"2:3.15.4-1ubuntu4",
"2:3.15.4-1ubuntu5",
"2:3.15.4-1ubuntu6",
"2:3.15.4-1ubuntu7",
"2:3.15.4-1ubuntu7.1",
"2:3.17-0ubuntu0.14.04.1",
"2:3.17.1-0ubuntu0.14.04.1",
"2:3.17.1-0ubuntu0.14.04.2",
"2:3.17.4-0ubuntu0.14.04.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "thunderbird",
"binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
},
{
"binary_name": "thunderbird-globalmenu",
"binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
},
{
"binary_name": "thunderbird-gnome-support",
"binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
},
{
"binary_name": "thunderbird-mozsymbols",
"binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
},
{
"binary_name": "thunderbird-testsuite",
"binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
},
{
"binary_name": "xul-ext-calendar-timezones",
"binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
},
{
"binary_name": "xul-ext-gdata-provider",
"binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
},
{
"binary_name": "xul-ext-lightning",
"binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "thunderbird",
"purl": "pkg:deb/ubuntu/thunderbird@1:31.8.0+build1-0ubuntu0.14.04.1?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:31.8.0+build1-0ubuntu0.14.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:24.0+build1-0ubuntu1",
"1:24.0+build1-0ubuntu2",
"1:24.1.1+build1-0ubuntu0.13.10.1",
"1:24.1.1+build1-0ubuntu1",
"1:24.2.0+build1-0ubuntu1",
"1:24.4.0+build1-0ubuntu1",
"1:24.5.0+build1-0ubuntu0.14.04.1",
"1:24.6.0+build1-0ubuntu0.14.04.1",
"1:31.0+build1-0ubuntu0.14.04.1",
"1:31.1.1+build1-0ubuntu0.14.04.1",
"1:31.1.2+build1-0ubuntu0.14.04.1",
"1:31.2.0+build2-0ubuntu0.14.04.1",
"1:31.3.0+build1-0ubuntu0.14.04.1",
"1:31.4.0+build1-0ubuntu0.14.04.1",
"1:31.5.0+build1-0ubuntu0.14.04.1",
"1:31.6.0+build1-0ubuntu0.14.04.1",
"1:31.7.0+build1-0ubuntu0.14.04.1"
]
}
],
"aliases": [],
"details": "Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a \"SMACK SKIP-TLS\" issue.",
"id": "UBUNTU-CVE-2015-2721",
"modified": "2026-04-22T07:37:47Z",
"published": "2015-07-05T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2015-2721"
},
{
"type": "REPORT",
"url": "https://www.mozilla.org/en-US/security/advisories/mfsa2015-71/"
},
{
"type": "REPORT",
"url": "https://smacktls.com"
},
{
"type": "REPORT",
"url": "https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.19_release_notes"
},
{
"type": "REPORT",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1086145"
},
{
"type": "REPORT",
"url": "http://www.mozilla.org/security/announce/2015/mfsa2015-71.html"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-2672-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-2656-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-2656-2"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-2673-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2015-2721"
}
],
"related": [
"USN-2672-1",
"USN-2656-1",
"USN-2656-2",
"USN-2673-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2015-2721"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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