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attackerkbAttackerKBAKB:6639DB62-5B8A-47FF-8269-A1F22B5B9531
HistoryAug 07, 2020 - 12:00 a.m.

CVE-2020-11984 — Multiple Vulnerabilities in Apache Web Server Could Allow for Remote Code Execution

2020-08-0700:00:00
attackerkb.com
346

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

JSON

Apache HTTP server 2.4.32 to 2.4.44 mod_proxy_uwsgi info disclosure and possible RCE

Recent assessments:

dabdine-r7 at August 26, 2020 8:06pm UTC reported:

The details for this vulnerability were scant from Apache, but this is actually an integer overflow in the mod_proxy_uwsgi Apache module. Specifically, if you send enough headers, you can overflow the packet size that gets encoded into the uWSGI protocol header struct. If you do this, you may be able to coerce the uWSGI middleware service to interpret some of the header data as a new uWSGI packet. uWSGI allows file read and remote code execution as part of the protocol.

Here’s the patch that was silently added from ASF (ignore the 16K comment too, since that is wrong, and it should’ve been 65K):
https://github.com/apache/httpd/commit/fb08e475bf322f081665fa6f9d9e346136df9337#

In practice this is a bit difficult to exploit, but could in theory lead to tasty, tasty shells. The most interesting thing about this vulnerability is that you would interpret the title as an issue that allows for code execution within the context of Apache itself, whereas in reality it is an issue which allows payload stuffing that ultimately can lead to command execution by crafted payloads sent to the uWSGI middleware/backend service that Apache fronts.

Assessed Attacker Value: 2
Assessed Attacker Value: 2Assessed Attacker Value: 2

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9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

JSON
Related for AKB:6639DB62-5B8A-47FF-8269-A1F22B5B9531
attackerkb5suse3nessus51freebsd2f51mageia1amazon6fortinet1kaspersky2thn1gentoo1ibm23fedora4photon5debian3osv14ubuntu3oraclelinux3almalinux1rocky1redhat7veracode4cve4redhatcve4alpinelinux4httpd4ubuntucve4debiancve4prion4zdt2cbl_mariner3hackerone1rosalinux2checkpoint_advisories1qualysblog1ics1oracle2