Bug 46777 - openssl: Multiple issues (4.3)
openssl: Multiple issues (4.3)
Status: CLOSED FIXED
Product: UCS
Classification: Unclassified
Component: Security updates
UCS 4.3
All Linux
: P3 normal (vote)
: UCS 4.3-0-errata
Assigned To: Philipp Hahn
Arvid Requate
:
Depends on:
Blocks:
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Reported: 2018-04-04 17:17 CEST by Philipp Hahn
Modified: 2018-05-16 17:04 CEST (History)
1 user (show)

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What kind of report is it?: Security Issue
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Max CVSS v3 score: 6.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)


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Description Philipp Hahn univentionstaff 2018-04-04 17:17:38 CEST
New Debian openssl 1.1.0f-3+deb9u2 fixes:
This update addresses the following issues:
* Because of an implementation bug the PA-RISC CRYPTO_memcmp function is
  effectively reduced to only comparing the least significant bit of each
  byte. This allows an attacker to forge messages that would be considered as
  authenticated in an amount of tries lower than that guaranteed by the
  security claims of the scheme. The module can only be compiled by the HP-UX
  assembler, so that only HP-UX PA-RISC targets are affected. (CVE-2018-0733)
* Constructed ASN.1 types with a recursive definition (such as can be found
  in PKCS7) could eventually exceed the stack given malicious input with
  excessive recursion. This could result in a Denial Of Service attack. There
  are no such structures used within SSL/TLS that come from untrusted sources
  so this is considered safe. (CVE-2018-0739)
* 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. (CVE-2017-3738)

CVE-2017-3738 openssl: rsaz_1024_mul_avx2 overflow bug on x86_64
CVE-2018-0733 openssl: Implementation bug in PA-RISC CRYPTO_memcmp function allows attackers to forge authenticated messages in a reduced number of attempts
CVE-2018-0739 openssl: Handling of crafted recursive ASN.1 structures can cause a stack overflow and resulting denial of service
Comment 1 Philipp Hahn univentionstaff 2018-04-04 17:22:01 CEST
[4.3-0] 6e0620abfe Bug #46777: openssl_1.1.0f-3+deb9u2
Comment 2 Quality Assurance univentionstaff 2018-05-04 16:44:17 CEST
--- mirror/ftp/4.3/unmaintained/4.3-0/source/openssl_1.1.0f-3+deb9u1.dsc
+++ apt/ucs_4.3-0-errata4.3-0/source/openssl_1.1.0f-3+deb9u2.dsc
@@ -1,3 +1,13 @@
+1.1.0f-3+deb9u2 [Thu, 29 Mar 2018 12:51:02 +0200] Sebastian Andrzej Siewior <sebastian@breakpoint.cc>:
+
+  * CVE-2017-3738 (rsaz_1024_mul_avx2 overflow bug on x86_64)
+  * CVE-2018-0733 (Incorrect CRYPTO_memcmp on HP-UX PA-RISC)
+  * CVE-2018-0739 (Constructed ASN.1 types with a recursive definition could
+    exceed the stack)
+  * Add patches to pass the testsuite:
+    - Fix-a-Proxy-race-condition.patch
+    - Fix-race-condition-in-TLSProxy.patch
+
 1.1.0f-3+deb9u1 [Thu, 02 Nov 2017 12:29:36 +0100] Kurt Roeckx <kurt@roeckx.be>:
 
   * Fix CVE-2017-3735
Comment 3 Arvid Requate univentionstaff 2018-05-15 11:09:47 CEST
* No UCS specific patches
* Comparison to previously shipped version ok
* Binary package update Ok
* Advisory adjusted:
  65bb8604c9 | Sort CVEs
Comment 4 Arvid Requate univentionstaff 2018-05-16 17:04:21 CEST
<http://errata.software-univention.de/ucs/4.3/64.html>