high
8.8
CWE
120
Advisory Published
Updated

CVE-2019-11759

First published: Tue Oct 22 2019(Updated: )

A flaw was discovered in both Firefox and Thunderbird where 4 bytes of a HMAC output could be written past the end of a buffer stored on the memory stack. This could allow an attacker to execute arbitrary code or lead to a crash. This flaw can be exploited over the network.

Credit: security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
redhat/firefox<0:68.2.0-4.el6_10
0:68.2.0-4.el6_10
redhat/thunderbird<0:68.2.0-2.el6_10
0:68.2.0-2.el6_10
redhat/firefox<0:68.2.0-1.el7_7
0:68.2.0-1.el7_7
redhat/thunderbird<0:68.2.0-1.el7_7
0:68.2.0-1.el7_7
redhat/firefox<0:68.2.0-2.el8_0
0:68.2.0-2.el8_0
redhat/thunderbird<0:68.2.0-1.el8_0
0:68.2.0-1.el8_0
redhat/firefox<68.2
68.2
redhat/thunderbird<68.2
68.2
Mozilla Thunderbird<68.2
68.2
Mozilla Firefox ESR<68.2
68.2
Mozilla Firefox<70
70
Mozilla Firefox<70.0
Mozilla Firefox ESR<68.2
Mozilla Thunderbird<68.2
Canonical Ubuntu Linux=16.04
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0
70.0
ubuntu/firefox<70.0+
70.0+
ubuntu/thunderbird<1:68.2.1+
1:68.2.1+
ubuntu/thunderbird<1:68.2.1+
1:68.2.1+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<68.2
68.2
ubuntu/thunderbird<1:68.7.0+
1:68.7.0+
debian/firefox
125.0.3-1
debian/firefox-esr
91.12.0esr-1~deb10u1
115.10.0esr-1~deb10u1
115.7.0esr-1~deb11u1
115.10.0esr-1~deb11u1
115.7.0esr-1~deb12u1
115.10.0esr-1~deb12u1
115.10.0esr-1
debian/thunderbird
1:91.12.0-1~deb10u1
1:115.10.1-1~deb10u1
1:115.7.0-1~deb11u1
1:115.10.1-1~deb11u1
1:115.7.0-1~deb12u1
1:115.10.1-1~deb12u1
1:115.10.1-1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2019-11759?

    CVE-2019-11759 is a vulnerability that could allow an attacker to execute arbitrary code or cause a crash by writing 4 bytes of HMAC output past the end of a buffer stored on the stack.

  • Which software versions are affected by CVE-2019-11759?

    Firefox versions earlier than 70, Thunderbird versions earlier than 68.2, and Firefox ESR versions earlier than 68.2 are affected by CVE-2019-11759.

  • What is the severity of CVE-2019-11759?

    CVE-2019-11759 has a high severity rating of 8.8.

  • How can this vulnerability be fixed?

    To fix CVE-2019-11759, update Firefox to version 70 or later, Thunderbird to version 68.2 or later, and Firefox ESR to version 68.2 or later.

  • Where can I find more information about CVE-2019-11759?

    More information about CVE-2019-11759 can be found in the following references: [Mozilla Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1577953), [Mozilla Security Advisory](https://www.mozilla.org/en-US/security/advisories/mfsa2019-33/), [Mozilla Security Advisory](https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/).

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