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Issue 797483 link

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Issue metadata

Status: Fixed
Owner: ----
Closed: Jan 2018
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 2
Type: Bug-Security



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CrOS: Vulnerability reported in dev-libs/openssl

Project Member Reported by vomit.go...@appspot.gserviceaccount.com, Dec 23 2017

Issue description

Automated analysis has detected that the following third party packages have had vulnerabilities publicly reported. 

NOTE: There may be several bugs listed below - in almost all cases, all bugs can be quickly addressed by upgrading to the latest version of the package.

Package Name: dev-libs/openssl
Package Version: [cpe:/a:openssl:openssl:1.0.2j cpe:/a:openssl:openssl:1.0.2k]

Advisory: CVE-2017-3737
  Details: https://vomit.googleplex.com/advisory?id=CVE/CVE-2017-3737
  CVSS severity score: 4.3/10.0
  Confidence: high
  Description:

OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism. The intent was that if a fatal error occurred during a handshake then OpenSSL would move into the error state and would immediately fail if you attempted to continue the handshake. This works as designed for the explicit handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a bug it does not work correctly if SSL_read() or SSL_write() is called directly. In that scenario, if the handshake fails then a fatal error will be returned in the initial function call. If SSL_read()/SSL_write() is subsequently called by the application for the same SSL object then it will succeed and the data is passed without being decrypted/encrypted directly from the SSL/TLS record layer. In order to exploit this issue an application bug would have to be present that resulted in a call to SSL_read()/SSL_write() being issued after having already received a fatal error. OpenSSL version 1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL 1.1.0 is not affected.
Advisory: CVE-2017-3738
  Details: https://vomit.googleplex.com/advisory?id=CVE/CVE-2017-3738
  CVSS severity score: 4.3/10.0
  Confidence: high
  Description:

There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH1024 are considered just feasible, because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.


 

Comment 1 by xzhou@chromium.org, Dec 24 2017

Cc: djkurtz@chromium.org
Labels: Security_Severity-Low
Status: Unconfirmed (was: Untriaged)
Change to Severity low because it requires an application bug as stated in the description. 

cc'ed djkurtz@ who seem to be working on openssl for CrOS. Is CrOS using boring SSL or OpenSSL 1.1 already?

Comment 2 by vapier@chromium.org, Dec 24 2017

neither of those are happening any time soon.  doing a version upgrade to the next 1.0.2 version shouldn't be a big deal though.
Components: OS>Packages
Labels: -ComponentOSKernel Security_Impact-Stable
Status: Available (was: Unconfirmed)
Leaving as low out of an abundance of caution.
Status: Fixed (was: Available)
vapier@'s CL has been merged.
Project Member

Comment 6 by sheriffbot@chromium.org, Jan 5 2018

Labels: -Restrict-View-SecurityTeam Restrict-View-SecurityNotify
Project Member

Comment 7 by sheriffbot@chromium.org, Apr 13 2018

Labels: -Restrict-View-SecurityNotify allpublic
This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

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