AttackerKBAKB:D0F5AA2A-4D99-41A6-9F83-6D0EA1AD01FCCVE-2017-9798
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user’s .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c.
Recent assessments:
h00die at March 25, 2020 12:20am UTC reported:
This vulnerability only happens when the Limit method is defined. This most likely isn’t very common in enterprise environments, and also the Limit method needs to be configured in an invalid way.
Pending all that is true, which is unlikely, its possible to send an OPTIONS HTTP request and get back arbitrary memory.
Unlike Heartbleed, we’re receiving back minimal memory and its also intermingled with the response.
From my testing, against a test server, no useful data was found. It’s possible a production server on a very busy website may have divulged more useful data, but it would have to be minimal due to the returned buffer size.
Assessed Attacker Value: 1
Assessed Attacker Value: 1Assessed Attacker Value: 5
References
openwall.com/lists/oss-security/2017/09/18/2
www.debian.org/security/2017/dsa-3980
www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
www.securityfocus.com/bid/100872
www.securityfocus.com/bid/105598
www.securitytracker.com/id/1039387
access.redhat.com/errata/RHSA-2017:2882
access.redhat.com/errata/RHSA-2017:2972
access.redhat.com/errata/RHSA-2017:3018
access.redhat.com/errata/RHSA-2017:3113
access.redhat.com/errata/RHSA-2017:3114
access.redhat.com/errata/RHSA-2017:3193
access.redhat.com/errata/RHSA-2017:3194
access.redhat.com/errata/RHSA-2017:3195
access.redhat.com/errata/RHSA-2017:3239
access.redhat.com/errata/RHSA-2017:3240
access.redhat.com/errata/RHSA-2017:3475
access.redhat.com/errata/RHSA-2017:3476
access.redhat.com/errata/RHSA-2017:3477
blog.fuzzing-project.org/60-Optionsbleed-HTTP-OPTIONS-method-can-leak-Apaches-server-memory.html
blog.fuzzing-project.org/uploads/apache-2.2-optionsbleed-backport.patch
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9798
github.com/apache/httpd/commit/29afdd2550b3d30a8defece2b95ae81edcf66ac9
github.com/apache/httpd/commit/4cc27823899e070268b906ca677ee838d07cf67a
github.com/hannob/optionsbleed
httpd.apache.org/security/vulnerabilities_24.html#CVE-2017-9798
lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/r15f9aa4427581a1aecb4063f1b4b983511ae1c9935e2a0a6876dad3c@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b@%3Ccvs.httpd.apache.org%3E
lists.apache.org/thread.html/rfcf929bd33a6833e3f0c35eebdad70d5060665f9c4e17ea467c66770@%3Ccvs.httpd.apache.org%3E
security-tracker.debian.org/tracker/CVE-2017-9798
security.gentoo.org/glsa/201710-32
security.netapp.com/advisory/ntap-20180601-0003
security.netapp.com/advisory/ntap-20180601-0003/
support.apple.com/HT208331
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us
svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/server/core.c?r1=1805223&r2=1807754&pathrev=1807754&view=patch
www.exploit-db.com/exploits/42745
www.exploit-db.com/exploits/42745/
www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
www.tenable.com/security/tns-2019-09
Related
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N