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                              CERT-Renater

                 Note d'Information No. 2017/VULN186
_____________________________________________________________________

DATE                : 20/06/2017

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache HTTP Server versions 2
                                prior to 2.2.33, 2.4.26.

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https://lists.apache.org/thread.html/3e51be301835fad1c4a875b07aa29a15709d34ec3900b262325c67ea@%3Cannounce.httpd.apache.org%3E
https://lists.apache.org/thread.html/c1717a43fc07e9bb1bd341c9d4107a865540115f934b0abd8c8ed811@%3Cannounce.httpd.apache.org%3E
https://lists.apache.org/thread.html/1d0b746bbaa3a64890fcdab59ee9050aaa633b7143e7d412374e5a9a@%3Cannounce.httpd.apache.org%3E
https://lists.apache.org/thread.html/5b8cd901f2018c20abfa865f7a7c98a6ef54b990154a16004110952d@%3Cannounce.httpd.apache.org%3E
https://lists.apache.org/thread.html/53ce83a58a8f1fb80a6ecb115fcfc65c530408c10ed66c04ee6f7c4a@%3Cannounce.httpd.apache.org%3E
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CVE-2017-3167: ap_get_basic_auth_pw authentication bypass

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.2.0 to 2.2.32
httpd 2.4.0 to 2.4.25

Description:
Use of the ap_get_basic_auth_pw() by third-party modules outside of the
authentication phase may lead to authentication requirements being
bypassed.

Mitigation:
2.2.x users should either apply the patch available at
https://www.apache.org/dist/httpd/patches/apply_to_2.2.32/CVE-2017-3167.patch
or upgrade in the future to 2.2.33, which is currently unreleased.

2.4.x users should upgrade to 2.4.26.

Third-party module writers SHOULD use ap_get_basic_auth_components(),
available in 2.2.33 and 2.4.26, instead of ap_get_basic_auth_pw().
Modules which call the legacy ap_get_basic_auth_pw() during the
authentication phase MUST either immediately authenticate the user after
the call, or else stop the request immediately with an error response,
to avoid incorrectly authenticating the current request.

Credit:
The Apache HTTP Server security team would like to thank Emmanuel
Dreyfus for reporting this issue.

References:
https://httpd.apache.org/security_report.html

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CVE-2017-3169: mod_ssl null pointer dereference

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.2.0 to 2.2.32
httpd 2.4.0 to 2.4.25

Description:
mod_ssl may dereference a NULL pointer when third-party modules call
ap_hook_process_connection() during an HTTP request to an HTTPS port.

Mitigation:
2.2.x users should either apply the patch available at
https://www.apache.org/dist/httpd/patches/apply_to_2.2.32/CVE-2017-3169.patch
or upgrade in the future to 2.2.33, which is currently unreleased.

2.4.x users should upgrade to 2.4.26.

Credit:
The Apache HTTP Server security team would like to thank Vasileios
Panopoulos and AdNovum Informatik AG for reporting this issue.

References:
https://httpd.apache.org/security_report.html

____________________________________________________________________


CVE-2017-7659: mod_http2 null pointer dereference

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.4.24 (unreleased)
httpd 2.4.25

Description:
A maliciously constructed HTTP/2 request could cause mod_http2 to
dereference a NULL pointer and crash the server process.

Mitigation:
2.4.25 users of mod_http2 should upgrade to 2.4.26.

Credit:
The Apache HTTP Server security team would like to thank Robert
Å\x{154}wiÄ\x{153}cki
for reporting this issue.

References:
https://httpd.apache.org/security_report.html

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CVE-2017-7668: ap_find_token buffer overread

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.2.32
httpd 2.4.24 (unreleased)
httpd 2.4.25

Description:
The HTTP strict parsing changes added in 2.2.32 and 2.4.24 introduced a
bug in token list parsing, which allows ap_find_token() to search past
the end of its input string. By maliciously crafting a sequence of
request headers, an attacker may be able to cause a segmentation fault,
or to force ap_find_token() to return an incorrect value.

Mitigation:
2.2.32 users should either apply the patch available at
https://www.apache.org/dist/httpd/patches/apply_to_2.2.32/CVE-2017-7668.patch
or upgrade in the future to 2.2.33, which is currently unreleased.

2.4.25 users should upgrade to 2.4.26.

Credit:
The Apache HTTP Server security team would like to thank Javier Jiménez
(javijmor@gmail.com) for reporting this issue.

References:
https://httpd.apache.org/security_report.html

____________________________________________________________________


CVE-2017-7679: mod_mime buffer overread

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.2.0 to 2.2.32
httpd 2.4.0 to 2.4.25

Description:
mod_mime can read one byte past the end of a buffer when sending a
malicious Content-Type response header.

Mitigation:
2.2.x users should either apply the patch available at
https://www.apache.org/dist/httpd/patches/apply_to_2.2.32/CVE-2017-7679.patch
or upgrade in the future to 2.2.33, which is currently unreleased.

2.4.x users should upgrade to 2.4.26.

Credit:
The Apache HTTP Server security team would like to thank ChenQin and
Hanno Böck for reporting this issue.

References:
https://httpd.apache.org/security_report.html


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