GSD-2020-24240
Vulnerability from gsd - Updated: 2023-12-13 01:22Details
GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a '\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-24240",
"description": "GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a \u0027\\0\u0027 byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.",
"id": "GSD-2020-24240",
"references": [
"https://www.suse.com/security/cve/CVE-2020-24240.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2020-24240"
],
"details": "GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a \u0027\\0\u0027 byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.",
"id": "GSD-2020-24240",
"modified": "2023-12-13T01:22:12.078846Z",
"schema_version": "1.4.0"
}
},
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"ID": "CVE-2020-24240",
"STATE": "PUBLIC"
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"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "n/a",
"version": {
"version_data": [
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"version_value": "n/a"
}
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"description": {
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"value": "GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a \u0027\\0\u0027 byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison."
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"name": "https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d",
"refsource": "MISC",
"url": "https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d"
},
{
"name": "https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html",
"refsource": "MISC",
"url": "https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html"
},
{
"name": "https://github.com/akimd/bison/compare/v3.7...v3.7.1",
"refsource": "MISC",
"url": "https://github.com/akimd/bison/compare/v3.7...v3.7.1"
}
]
}
},
"gitlab.com": {
"advisories": [
{
"affected_range": "=3.7",
"affected_versions": "Version 3.7",
"cvss_v2": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
"cvss_v3": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"cwe_ids": [
"CWE-1035",
"CWE-416",
"CWE-937"
],
"date": "2020-09-02",
"description": "GNU Bison has a use-after-free in `_obstack_free` in `lib/obstack.c` (called from gram_lex) when a \u0027\\0\u0027 byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.",
"fixed_versions": [
"3.7.1"
],
"identifier": "CVE-2020-24240",
"identifiers": [
"CVE-2020-24240"
],
"not_impacted": "All versions before 3.7, all versions after 3.7",
"package_slug": "conan/bison",
"pubdate": "2020-08-25",
"solution": "Upgrade to version 3.7.1 or above.",
"title": "Use After Free",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-24240",
"https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html"
],
"uuid": "6079d864-47bb-41bf-b205-75e1d72263cd"
}
]
},
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"cpe_match": [
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"cpe_name": [],
"vulnerable": true
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"ID": "CVE-2020-24240"
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"description": {
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"value": "GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a \u0027\\0\u0027 byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison."
}
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"problemtype": {
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},
"references": {
"reference_data": [
{
"name": "https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d",
"refsource": "MISC",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d"
},
{
"name": "https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html",
"refsource": "MISC",
"tags": [
"Mailing List",
"Vendor Advisory"
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"url": "https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html"
},
{
"name": "https://github.com/akimd/bison/compare/v3.7...v3.7.1",
"refsource": "MISC",
"tags": [
"Third Party Advisory"
],
"url": "https://github.com/akimd/bison/compare/v3.7...v3.7.1"
}
]
}
},
"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.1,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 6.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "HIGH",
"userInteractionRequired": true
},
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
},
"lastModifiedDate": "2020-09-02T14:31Z",
"publishedDate": "2020-08-25T14:15Z"
}
}
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- 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
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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