Vulnerability Name:

CVE-2021-3466 (CCN-198808)

Assigned:2021-03-23
Published:2021-03-23
Updated:2021-12-15
Summary:A flaw was found in libmicrohttpd. A missing bounds check in the post_process_urlencoded function leads to a buffer overflow, allowing a remote attacker to write arbitrary data in an application that uses libmicrohttpd. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. Only version 0.9.70 is vulnerable.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
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): High
Integrity (I): High
Availibility (A): High
9.8 Critical (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
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): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:10.0 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
10.0 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-120
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-3466

Source: CCN
Type: Red Hat Bugzilla – Bug 1939127
(CVE-2021-3466) - CVE-2021-3466 libmicrohttpd: Buffer overflow issue in URL parser in the post_process_urlencoded function

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1939127

Source: XF
Type: UNKNOWN
libmicrohttpd-cve20213466-bo(198808)

Source: CCN
Type: libmicrohttpd GIT Repository
first experimental rewrite of URL postprocessor, still fails, not production ready

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-6d5578e756

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-5e10ad8c19

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-d4149ff7fb

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-3466

Vulnerable Configuration:Configuration 1:
  • cpe:/a:gnu:libmicrohttpd:0.9.70:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:fedoraproject:fedora:32:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:34:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:gnu:libmicrohttpd:0.9.70:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    gnu libmicrohttpd 0.9.70
    redhat enterprise linux 6.0
    redhat enterprise linux 7.0
    redhat enterprise linux 8.0
    fedoraproject fedora 32
    fedoraproject fedora 33
    fedoraproject fedora 34
    gnu libmicrohttpd 0.9.70