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Test ID:1.3.6.1.4.1.25623.1.0.891518
Category:Debian Local Security Checks
Title:Debian LTS Advisory ([SECURITY] [DLA 1518-1] polarssl security update)
Summary:Two vulnerabilities were discovered in polarssl, a lightweight crypto and;SSL/TLS library (nowadays continued under the name mbedtls) which could;result in plain text recovery via side-channel attacks.;;Two other minor vulnerabilities were discovered in polarssl which could;result in arithmetic overflow errors.;;CVE-2018-0497;;As a protection against the Lucky Thirteen attack, the TLS code for;CBC decryption in encrypt-then-MAC mode performs extra MAC;calculations to compensate for variations in message size due to;padding. The amount of extra MAC calculation to perform was based on;the assumption that the bulk of the time is spent in processing;64-byte blocks, which is correct for most supported hashes but not for;SHA-384. Correct the amount of extra work for SHA-384 (and SHA-512;which is currently not used in TLS, and MD2 although no one should;care about that).;;This is a regression fix for what CVE-2013-0169 had been fixed this.;;CVE-2018-0498;;The basis for the Lucky 13 family of attacks is for an attacker to be;able to distinguish between (long) valid TLS-CBC padding and invalid;TLS-CBC padding. Since our code sets padlen = 0 for invalid padding,;the length of the input to the HMAC function gives information about;that.;;Information about this length (modulo the MD/SHA block size) can be;deduced from how much MD/SHA padding (this is distinct from TLS-CBC;padding) is used. If MD/SHA padding is read from a (static) buffer, a;local attacker could get information about how much is used via a;cache attack targeting that buffer.;;Let's get rid of this buffer. Now the only buffer used is the;internal MD/SHA one, which is always read fully by the process();function.;;CVE-2018-9988;;Prevent arithmetic overflow on bounds check and add bound check;before signature length read in ssl_parse_server_key_exchange().;;CVE-2018-9989;;Prevent arithmetic overflow on bounds check and add bound check;before length read in ssl_parse_server_psk_hint()
Description:Summary:
Two vulnerabilities were discovered in polarssl, a lightweight crypto and
SSL/TLS library (nowadays continued under the name mbedtls) which could
result in plain text recovery via side-channel attacks.

Two other minor vulnerabilities were discovered in polarssl which could
result in arithmetic overflow errors.

CVE-2018-0497

As a protection against the Lucky Thirteen attack, the TLS code for
CBC decryption in encrypt-then-MAC mode performs extra MAC
calculations to compensate for variations in message size due to
padding. The amount of extra MAC calculation to perform was based on
the assumption that the bulk of the time is spent in processing
64-byte blocks, which is correct for most supported hashes but not for
SHA-384. Correct the amount of extra work for SHA-384 (and SHA-512
which is currently not used in TLS, and MD2 although no one should
care about that).

This is a regression fix for what CVE-2013-0169 had been fixed this.

CVE-2018-0498

The basis for the Lucky 13 family of attacks is for an attacker to be
able to distinguish between (long) valid TLS-CBC padding and invalid
TLS-CBC padding. Since our code sets padlen = 0 for invalid padding,
the length of the input to the HMAC function gives information about
that.

Information about this length (modulo the MD/SHA block size) can be
deduced from how much MD/SHA padding (this is distinct from TLS-CBC
padding) is used. If MD/SHA padding is read from a (static) buffer, a
local attacker could get information about how much is used via a
cache attack targeting that buffer.

Let's get rid of this buffer. Now the only buffer used is the
internal MD/SHA one, which is always read fully by the process()
function.

CVE-2018-9988

Prevent arithmetic overflow on bounds check and add bound check
before signature length read in ssl_parse_server_key_exchange().

CVE-2018-9989

Prevent arithmetic overflow on bounds check and add bound check
before length read in ssl_parse_server_psk_hint()

Affected Software/OS:
polarssl on Debian Linux

Solution:
For Debian 8 'Jessie', these problems have been fixed in version
1.3.9-2.1+deb8u4.

We recommend that you upgrade your polarssl packages.

CVSS Score:
5.0

CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2013-0169
http://lists.apple.com/archives/security-announce/2013/Sep/msg00002.html
BugTraq ID: 57778
http://www.securityfocus.com/bid/57778
Cert/CC Advisory: TA13-051A
http://www.us-cert.gov/cas/techalerts/TA13-051A.html
CERT/CC vulnerability note: VU#737740
http://www.kb.cert.org/vuls/id/737740
Debian Security Information: DSA-2621 (Google Search)
http://www.debian.org/security/2013/dsa-2621
Debian Security Information: DSA-2622 (Google Search)
http://www.debian.org/security/2013/dsa-2622
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101366.html
http://security.gentoo.org/glsa/glsa-201406-32.xml
HPdes Security Advisory: HPSBMU02874
http://marc.info/?l=bugtraq&m=136733161405818&w=2
HPdes Security Advisory: HPSBOV02852
http://marc.info/?l=bugtraq&m=136432043316835&w=2
HPdes Security Advisory: HPSBUX02856
http://marc.info/?l=bugtraq&m=136396549913849&w=2
HPdes Security Advisory: HPSBUX02857
http://marc.info/?l=bugtraq&m=136439120408139&w=2
HPdes Security Advisory: HPSBUX02909
http://marc.info/?l=bugtraq&m=137545771702053&w=2
HPdes Security Advisory: SSRT101103
HPdes Security Advisory: SSRT101104
HPdes Security Advisory: SSRT101108
HPdes Security Advisory: SSRT101184
HPdes Security Advisory: SSRT101289
http://www.mandriva.com/security/advisories?name=MDVSA-2013:095
http://blog.fuseyism.com/index.php/2013/02/20/security-icedtea-2-1-6-2-2-6-2-3-7-for-openjdk-7-released/
http://www.isg.rhul.ac.uk/tls/TLStiming.pdf
https://lists.debian.org/debian-lts-announce/2018/09/msg00029.html
http://openwall.com/lists/oss-security/2013/02/05/24
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18841
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19016
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19424
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19540
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19608
RedHat Security Advisories: RHSA-2013:0587
http://rhn.redhat.com/errata/RHSA-2013-0587.html
RedHat Security Advisories: RHSA-2013:0782
http://rhn.redhat.com/errata/RHSA-2013-0782.html
RedHat Security Advisories: RHSA-2013:0783
http://rhn.redhat.com/errata/RHSA-2013-0783.html
RedHat Security Advisories: RHSA-2013:0833
http://rhn.redhat.com/errata/RHSA-2013-0833.html
RedHat Security Advisories: RHSA-2013:1455
http://rhn.redhat.com/errata/RHSA-2013-1455.html
RedHat Security Advisories: RHSA-2013:1456
http://rhn.redhat.com/errata/RHSA-2013-1456.html
http://www.securitytracker.com/id/1029190
http://secunia.com/advisories/53623
http://secunia.com/advisories/55108
http://secunia.com/advisories/55139
http://secunia.com/advisories/55322
http://secunia.com/advisories/55350
http://secunia.com/advisories/55351
SuSE Security Announcement: SUSE-SU-2013:0328 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2013-02/msg00020.html
SuSE Security Announcement: SUSE-SU-2013:0701 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00020.html
SuSE Security Announcement: SUSE-SU-2014:0320 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00001.html
SuSE Security Announcement: SUSE-SU-2015:0578 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00027.html
SuSE Security Announcement: openSUSE-SU-2013:0375 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2013-03/msg00000.html
SuSE Security Announcement: openSUSE-SU-2013:0378 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2013-03/msg00002.html
SuSE Security Announcement: openSUSE-SU-2016:0640 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00011.html
http://www.ubuntu.com/usn/USN-1735-1
Common Vulnerability Exposure (CVE) ID: CVE-2018-0497
Debian Security Information: DSA-4296 (Google Search)
https://www.debian.org/security/2018/dsa-4296
Common Vulnerability Exposure (CVE) ID: CVE-2018-0498
Common Vulnerability Exposure (CVE) ID: CVE-2018-9988
Common Vulnerability Exposure (CVE) ID: CVE-2018-9989
CopyrightCopyright (c) 2018 Greenbone Networks GmbH http://greenbone.net

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