PT SWARM

2021-08-31 12:22:55 PROXYTOKEN: AN AUTHENTICATION BYPASS IN MICROSOFT EXCHANGE SERVER
by Simon Zuckerbraun

With this vulnerability, an unauthenticated attacker can perform configuration actions on mailboxes belonging to arbitrary users, for example copying all emails addressed to a target account and forwarding them to an attacker-controlled account. The vulnerability arises due to the authentication module not being loaded on the back end.

Contents:
• The Trigger
• Understanding the Root Cause
• Bagging a Canary
• Conclusion

https://www.zerodayinitiative.com/blog/2021/8/30/proxytoken-an-authentication-bypass-in-microsoft-exchange-server Open / Comment

2021-08-23 17:45:06 Citrix has removed the acknowledgement of our researcher Mikhail Klyuchnikov who discovered and reported CVE-2019-19781 - the Citrix ADC RCE!

Current: https://support.citrix.com/article/CTX267027

Mar 2021: http://web.archive.org/web/20210321090412/https://support.citrix.com/article/CTX267027 Open / Comment

2021-08-12 18:53:02 MyBB fixed a Persistent XSS (CVE-2021-27279) in MyBB < 1.8.25 found by our researcher Igor Sak-Sakovskiy.

RCE is possible when chained with CVE-2021-27890, reported by Simon Scannell & Carl Smith.

Advisory: https://mybb.com/versions/1.8.25/ Open / Comment

2021-08-04 17:30:50 Site-wide CSRF using the GraphQL API Open / Comment

2021-08-04 12:50:52 SAML is insecure by design
by @joonas_fi

"In summary: once you base your security on some computed property, you can now exploit any flaws, differences or ambiguity in this computation. The more complex the computation is, the more dangerous it gets."

Contents:
• What is SAML?
• Why should I care?
• Why is SAML insecure?
• Why is signing computed values dangerous?
• The SAML vulnerability in practice
• Why is SAML this way?
• Vulnerability mitigation
• How could SAML have been designed better?
• More SAML weirdness
• Why is SAML used if it sucks?
• Action
• Ignorance is bliss
• Additional reading

https://joonas.fi/2021/08/saml-is-insecure-by-design/ Open / Comment

2021-07-29 17:02:34 We would like to share with the community some uncommon but not unique cases from our experience. Let us know if you like this format.

Stored XSS using .xbl files. Open / Comment

2021-07-29 15:54:57 NTLM relaying to AD CS - On certificates, printers and a little hippo
by @_dirkjan

More Active Directory NTLM relaying wizardry from Dirk-jan, this time aggregating and unifying multiple different tools and techniques, culminating in the release of PKINITtools.

Contents:
• Background - the state of NTLM relaying
• Exploring AD CS relaying
• Abusing the obtained certificate - diving into PKINIT
• Obtaining the NT hash of the impersonated computer account
• Using S4U2Self to obtain access to the relayed machine
• Other abuse avenues of PetitPotam
• Defenses
• Credits / Thanks / Tools

https://dirkjanm.io/ntlm-relaying-to-ad-certificate-services/ Open / Comment

2021-07-28 12:46:24 You should turn off autofill in your password manager
by @marektoth

11 of the 16 tested browser and password manager combinations, using default configurations and adhering to best-practices, could be compromised in one mouse click by the user, allowing attackers access to plain-text saved login credentials.

Contents:
• Autofill
• Autofill in chromium-based browsers
• Abuse of the autofill? Cross-Site Scripting (XSS)
• Analysis of browsers and password managers
• Limitation
• Script and demo
• Clickjacking KeePassXC-Browser
• Potential risks for users
• Potential risks for companies / Recommendation for InfoSec
• Recommendation
• Conclusion

https://marektoth.com/blog/password-managers-autofill/ Open / Comment

2021-07-22 16:44:25 Cisco fixed a Post-Auth RCE (CVE-2021-1518) in Firepower Device Manager found by our researchers Nikita Abramov and Mikhail Klyuchnikov.

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fdm-rce-Rx6vVurq Open / Comment

2021-07-21 18:09:14 Sequoia: A Local Privilege Escalation Vulnerability in Linux’s Filesystem Layer (CVE-2021-33909)
by Bharat Jogi

"The Qualys Research Team has discovered a size_t-to-int type conversion vulnerability in the Linux Kernel’s filesystem layer affecting most Linux operating systems. Any unprivileged user can gain root privileges on a vulnerable host by exploiting this vulnerability in a default configuration."

Contents:
• About Linux Filesystem
• Impact
• Disclosure Timeline
• Proof of Concept Video
• Technical Details
• Solution
• Qualys Coverage
• Dashboard
• Vendor References
• Frequently Asked Questions (FAQs)

https://blog.qualys.com/vulnerabilities-threat-research/2021/07/20/sequoia-a-local-privilege-escalation-vulnerability-in-linuxs-filesystem-layer-cve-2021-33909 Open / Comment