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cve[email protected]CVE-2023-29409
HistoryAug 02, 2023 - 8:15 p.m.

CVE-2023-29409

2023-08-0220:15:11
CWE-400
web.nvd.nist.gov
278
cve-2023-29409
security
rsa keys
certificate chains
cpu time
tls
nvd
vulnerability

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.6 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

25.9%

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.

Affected configurations

NVD
Node
golanggoRange<1.19.12
OR
golanggoRange1.20.01.20.7
OR
golanggoMatch1.21.0rc1
OR
golanggoMatch1.21.0rc2
OR
golanggoMatch1.21.0rc3

CNA Affected

[
  {
    "vendor": "Go standard library",
    "product": "crypto/tls",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "crypto/tls",
    "versions": [
      {
        "version": "0",
        "lessThan": "1.19.12",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.20.0-0",
        "lessThan": "1.20.7",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.21.0-0",
        "lessThan": "1.21.0-rc.4",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "Conn.verifyServerCertificate"
      },
      {
        "name": "Conn.processCertsFromClient"
      },
      {
        "name": "Conn.Handshake"
      },
      {
        "name": "Conn.HandshakeContext"
      },
      {
        "name": "Conn.Read"
      },
      {
        "name": "Conn.Write"
      },
      {
        "name": "Dial"
      },
      {
        "name": "DialWithDialer"
      },
      {
        "name": "Dialer.Dial"
      },
      {
        "name": "Dialer.DialContext"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.6 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

25.9%