5.3

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2018-15919

CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote...

Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or "oracle") as a vulnerability.'

(GitHub Advisory)

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CVE-2018-15919

CVE-2018-15919:

5.3

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability (CVE-2018-15919) is a username enumeration issue in OpenSSH's GSSAPI authentication, specifically within the 'auth-gss2.c' file. Since no specific commit or patch details are available, the analysis relies on the description of the vulnerability. The functions within 'auth-gss2.c' that handle GSSAPI authentication are the ones that would exhibit the 'remotely observable behaviour.' Common function names for GSSAPI authentication handling in OpenSSH include variations of 'userauth_gssapi' or 'ssh_gssapi_server_auth'. These functions would process authentication requests and, due to the vulnerability, would respond differently (e.g., timing, error codes) depending on whether the username exists, thus allowing enumeration. The confidence is 'medium' because, without the exact code or patch, the function names are inferred based on common practices and the file name provided in the vulnerability description.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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