Vulnerability-Lookup

CNVD-2020-20387

Vulnerability from cnvd - Published: 2020-03-31

Title

GNU C Library ASLR绕过漏洞

Description

GNU C Library (glibc)是一种按照LGPL许可协议发布的、开源、免费、方便从网络下载的C的编译程序。 GNU C Library (glibc) 2.31之前版本在x86-64架构上存在ASLR绕过漏洞。该漏洞源于GNU C Library在安全过渡后的程序执行期间未能忽略LD_PREFER_MAP_32BIT_EXEC环境变量。本地攻击者可利用该漏洞限制已加载库的可能映射地址，从而可绕过setuid程序的ASLR（地址空间布局随机化）。

Severity

低

Patch Name

GNU C Library ASLR绕过漏洞的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://sourceware.org/ml/libc-alpha/2019-11/msg00649.html

Reference

https://nvd.nist.gov/vuln/detail/CVE-2019-19126

Impacted products

Name
Gnu GNU C Library <2.31

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2019-19126",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2019-19126"
    }
  },
  "description": "GNU C Library (glibc)\u662f\u4e00\u79cd\u6309\u7167LGPL\u8bb8\u53ef\u534f\u8bae\u53d1\u5e03\u7684\u3001\u5f00\u6e90\u3001\u514d\u8d39\u3001\u65b9\u4fbf\u4ece\u7f51\u7edc\u4e0b\u8f7d\u7684C\u7684\u7f16\u8bd1\u7a0b\u5e8f\u3002\n\nGNU C Library (glibc) 2.31\u4e4b\u524d\u7248\u672c\u5728x86-64\u67b6\u6784\u4e0a\u5b58\u5728ASLR\u7ed5\u8fc7\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8eGNU C Library\u5728\u5b89\u5168\u8fc7\u6e21\u540e\u7684\u7a0b\u5e8f\u6267\u884c\u671f\u95f4\u672a\u80fd\u5ffd\u7565LD_PREFER_MAP_32BIT_EXEC\u73af\u5883\u53d8\u91cf\u3002\u672c\u5730\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u9650\u5236\u5df2\u52a0\u8f7d\u5e93\u7684\u53ef\u80fd\u6620\u5c04\u5730\u5740\uff0c\u4ece\u800c\u53ef\u7ed5\u8fc7setuid\u7a0b\u5e8f\u7684ASLR\uff08\u5730\u5740\u7a7a\u95f4\u5e03\u5c40\u968f\u673a\u5316\uff09\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://sourceware.org/ml/libc-alpha/2019-11/msg00649.html",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-20387",
  "openTime": "2020-03-31",
  "patchDescription": "GNU C Library (glibc)\u662f\u4e00\u79cd\u6309\u7167LGPL\u8bb8\u53ef\u534f\u8bae\u53d1\u5e03\u7684\u3001\u5f00\u6e90\u3001\u514d\u8d39\u3001\u65b9\u4fbf\u4ece\u7f51\u7edc\u4e0b\u8f7d\u7684C\u7684\u7f16\u8bd1\u7a0b\u5e8f\u3002\r\n\r\nGNU C Library (glibc) 2.31\u4e4b\u524d\u7248\u672c\u5728x86-64\u67b6\u6784\u4e0a\u5b58\u5728ASLR\u7ed5\u8fc7\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8eGNU C Library\u5728\u5b89\u5168\u8fc7\u6e21\u540e\u7684\u7a0b\u5e8f\u6267\u884c\u671f\u95f4\u672a\u80fd\u5ffd\u7565LD_PREFER_MAP_32BIT_EXEC\u73af\u5883\u53d8\u91cf\u3002\u672c\u5730\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u9650\u5236\u5df2\u52a0\u8f7d\u5e93\u7684\u53ef\u80fd\u6620\u5c04\u5730\u5740\uff0c\u4ece\u800c\u53ef\u7ed5\u8fc7setuid\u7a0b\u5e8f\u7684ASLR\uff08\u5730\u5740\u7a7a\u95f4\u5e03\u5c40\u968f\u673a\u5316\uff09\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "GNU C Library ASLR\u7ed5\u8fc7\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Gnu GNU C Library \u003c2.31"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2019-19126",
  "serverity": "\u4f4e",
  "submitTime": "2019-11-20",
  "title": "GNU C Library ASLR\u7ed5\u8fc7\u6f0f\u6d1e"
}

CVE-2019-19126 (GCVE-0-2019-19126)

Vulnerability from cvelistv5 – Published: 2019-11-19 00:00 – Updated: 2024-08-05 02:09

Summary

On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

5 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=25204
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://usn.ubuntu.com/4416-1/	vendor-advisory
https://lists.debian.org/debian-lts-announce/2022…	mailing-list

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T02:09:39.390Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
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            "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=25204"
          },
          {
            "name": "FEDORA-2020-1a3bdfde17",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZFJ5E7NWOL6ROE5QVICHKIOUGCPFJVUH/"
          },
          {
            "name": "FEDORA-2020-c32e4b271c",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4FQ5LC6JOYSOYFPRUZ4S45KL6IP3RPPZ/"
          },
          {
            "name": "USN-4416-1",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://usn.ubuntu.com/4416-1/"
          },
          {
            "name": "[debian-lts-announce] 20221017 [SECURITY] [DLA 3152-1] glibc security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
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        }
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          "lang": "en",
          "value": "On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program."
        }
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        "dateUpdated": "2022-10-17T00:00:00.000Z",
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      },
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          "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=25204"
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        {
          "name": "FEDORA-2020-1a3bdfde17",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZFJ5E7NWOL6ROE5QVICHKIOUGCPFJVUH/"
        },
        {
          "name": "FEDORA-2020-c32e4b271c",
          "tags": [
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          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4FQ5LC6JOYSOYFPRUZ4S45KL6IP3RPPZ/"
        },
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    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
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    "datePublished": "2019-11-19T00:00:00.000Z",
    "dateReserved": "2019-11-19T00:00:00.000Z",
    "dateUpdated": "2024-08-05T02:09:39.390Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

Detection rules are retrieved from Rulezet.

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.

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.