Vulnerability Name:

CVE-2021-40524 (CCN-208743)

Assigned:2021-07-29
Published:2021-07-29
Updated:2021-11-26
Summary:In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.)
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.6 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-434
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-40524

Source: XF
Type: UNKNOWN
pureftpd-cve202140524-dos(208743)

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50

Source: CCN
Type: pure-ftpd GIT Repository
fix the maxfile_size checking bug #158

Source: MISC
Type: Exploit, Third Party Advisory
https://github.com/jedisct1/pure-ftpd/pull/158

Vulnerable Configuration:Configuration 1:
  • cpe:/a:pureftpd:pure-ftpd:*:*:*:*:*:*:*:* (Version >= 1.0.23 and < 1.0.50)

    • Configuration CCN 1:
  • cpe:/a:pureftpd:pure-ftpd:1.0.49:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    pureftpd pure-ftpd *
    pureftpd pure-ftpd 1.0.49