Vulnerability-Lookup

CNVD-2016-01639

Vulnerability from cnvd - Published: 2016-03-15

Title

libssh2安全绕过漏洞

Description

libssh2是一个用于实现SSH2协议的客户端C库。 libssh2中存在安全漏洞，允许远程攻击者可利用漏洞，使SSHv2 Diffie-Hellman握手使用不安全的随机参数。

Severity

中

Patch Name

libssh2安全绕过漏洞的补丁

Patch Description

libssh2是一个用于实现SSH2协议的客户端C库。 libssh2中存在安全漏洞，允许远程攻击者可利用漏洞，使SSHv2 Diffie-Hellman握手使用不安全的随机参数。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

用户可参考如下厂商提供的安全补丁以修复该漏洞： https://www.libssh2.org/adv_20160223.html

Reference

https://www.libssh2.org/adv_20160223.html

Impacted products

Name
libssh2 libssh2 <= 1.6.0

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2016-0787"
    }
  },
  "description": "libssh2\u662f\u4e00\u4e2a\u7528\u4e8e\u5b9e\u73b0SSH2\u534f\u8bae\u7684\u5ba2\u6237\u7aefC\u5e93\u3002\r\n\r\nlibssh2\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u5141\u8bb8\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\uff0c\u4f7fSSHv2 Diffie-Hellman\u63e1\u624b\u4f7f\u7528\u4e0d\u5b89\u5168\u7684\u968f\u673a\u53c2\u6570\u3002",
  "discovererName": "Andreas Schneider",
  "formalWay": "\u7528\u6237\u53ef\u53c2\u8003\u5982\u4e0b\u5382\u5546\u63d0\u4f9b\u7684\u5b89\u5168\u8865\u4e01\u4ee5\u4fee\u590d\u8be5\u6f0f\u6d1e\uff1a\r\nhttps://www.libssh2.org/adv_20160223.html",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2016-01639",
  "openTime": "2016-03-15",
  "patchDescription": "libssh2\u662f\u4e00\u4e2a\u7528\u4e8e\u5b9e\u73b0SSH2\u534f\u8bae\u7684\u5ba2\u6237\u7aefC\u5e93\u3002\r\n\r\nlibssh2\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u5141\u8bb8\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\uff0c\u4f7fSSHv2 Diffie-Hellman\u63e1\u624b\u4f7f\u7528\u4e0d\u5b89\u5168\u7684\u968f\u673a\u53c2\u6570\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": "libssh2\u5b89\u5168\u7ed5\u8fc7\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "libssh2 libssh2 \u003c= 1.6.0"
  },
  "referenceLink": "https://www.libssh2.org/adv_20160223.html",
  "serverity": "\u4e2d",
  "submitTime": "2016-03-13",
  "title": "libssh2\u5b89\u5168\u7ed5\u8fc7\u6f0f\u6d1e"
}

CVE-2016-0787 (GCVE-0-2016-0787)

Vulnerability from cvelistv5 – Published: 2016-04-13 17:00 – Updated: 2024-08-05 22:30

Summary

The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

Severity

No CVSS data available.

CWE

Assigner

redhat redhat root

References

12 references

URL	Tags
http://lists.fedoraproject.org/pipermail/package-…	vendor-advisoryx_refsource_FEDORA
https://kc.mcafee.com/corporate/index?page=conten…	x_refsource_CONFIRM
http://www.oracle.com/technetwork/topics/security…	x_refsource_CONFIRM
https://www.libssh2.org/CVE-2016-0787.patch	x_refsource_CONFIRM
https://www.libssh2.org/adv_20160223.html	x_refsource_CONFIRM
https://puppet.com/security/cve/CVE-2016-0787	x_refsource_CONFIRM
http://lists.fedoraproject.org/pipermail/package-…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/201606-12	vendor-advisoryx_refsource_GENTOO
http://lists.opensuse.org/opensuse-updates/2016-0…	vendor-advisoryx_refsource_SUSE
https://bto.bluecoat.com/security-advisory/sa120	x_refsource_CONFIRM
http://www.debian.org/security/2016/dsa-3487	vendor-advisoryx_refsource_DEBIAN
http://www.securityfocus.com/bid/82514	vdb-entryx_refsource_BID

Date Public

2016-02-23 00:00

Show details on NVD website

JSON

To clipboard

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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.
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.