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symantecSymantec Security ResponseSMNTC-110157
HistorySep 04, 2019 - 12:00 a.m.

Libexpat Expat CVE-2019-15903 Heap Buffer Overflow Vulnerability

2019-09-0400:00:00
Symantec Security Response
www.symantec.com
80

Description

Libexpat Expat is prone to a heap-based buffer-overflow vulnerability. An attacker can exploit this issue to cause denial-of-service conditions. Libexpat Expat versions prior to 2.2.8 are vulnerable.

Technologies Affected

  • Libexpat Expat 1.95.1
  • Libexpat Expat 1.95.2
  • Libexpat Expat 1.95.4
  • Libexpat Expat 1.95.5
  • Libexpat Expat 1.95.6
  • Libexpat Expat 1.95.7
  • Libexpat Expat 1.95.8
  • Libexpat Expat 2.0.0
  • Libexpat Expat 2.0.1
  • Libexpat Expat 2.1.0
  • Libexpat Expat 2.2.1
  • Libexpat Expat 2.2.2
  • Libexpat Expat 2.2.3
  • Libexpat Expat 2.2.4
  • Libexpat Expat 2.2.5
  • Libexpat Expat 2.2.6
  • Libexpat Expat 2.2.7
  • Mozilla Firefox 0.1
  • Mozilla Firefox 0.10.0
  • Mozilla Firefox 0.10.1
  • Mozilla Firefox 0.2
  • Mozilla Firefox 0.3
  • Mozilla Firefox 0.4
  • Mozilla Firefox 0.5
  • Mozilla Firefox 0.6
  • Mozilla Firefox 0.6.1
  • Mozilla Firefox 0.7
  • Mozilla Firefox 0.7.1
  • Mozilla Firefox 0.8.0
  • Mozilla Firefox 0.9.0
  • Mozilla Firefox 0.9.0 Rc
  • Mozilla Firefox 0.9.1
  • Mozilla Firefox 0.9.2
  • Mozilla Firefox 0.9.3
  • Mozilla Firefox 1.0 Preview Release
  • Mozilla Firefox 1.0.0
  • Mozilla Firefox 1.0.1
  • Mozilla Firefox 1.0.2
  • Mozilla Firefox 1.0.3
  • Mozilla Firefox 1.0.4
  • Mozilla Firefox 1.0.5
  • Mozilla Firefox 1.0.6
  • Mozilla Firefox 1.0.7
  • Mozilla Firefox 1.0.8
  • Mozilla Firefox 1.4.1
  • Mozilla Firefox 1.5.0 12
  • Mozilla Firefox 1.5.0
  • Mozilla Firefox 1.5.0 Beta 1
  • Mozilla Firefox 1.5.0 Beta 2
  • Mozilla Firefox 1.5.0.1
  • Mozilla Firefox 1.5.0.10
  • Mozilla Firefox 1.5.0.11
  • Mozilla Firefox 1.5.0.2
  • Mozilla Firefox 1.5.0.3
  • Mozilla Firefox 1.5.0.4
  • Mozilla Firefox 1.5.0.5
  • Mozilla Firefox 1.5.0.6
  • Mozilla Firefox 1.5.0.7
  • Mozilla Firefox 1.5.0.8
  • Mozilla Firefox 1.5.0.9
  • Mozilla Firefox 1.5.1
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  • Mozilla Firefox 12.0 Beta6
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  • Mozilla Firefox 2.0 .1
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  • Mozilla Firefox 2.0 .6
  • Mozilla Firefox 2.0 .7
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  • Mozilla Firefox 2.0 8
  • Mozilla Firefox 2.0
  • Mozilla Firefox 2.0 Beta 1
  • Mozilla Firefox 2.0 Beta1
  • Mozilla Firefox 2.0 RC2
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  • Mozilla Firefox 2.0.0 .19
  • Mozilla Firefox 2.0.0 20
  • Mozilla Firefox 2.0.0.1
  • Mozilla Firefox 2.0.0.10
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  • Mozilla Firefox 2.0.0.19
  • Mozilla Firefox 2.0.0.2
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  • Mozilla Firefox 20.0
  • Mozilla Firefox 20.0.1
  • Mozilla Firefox 21.0
  • Mozilla Firefox 22.0
  • Mozilla Firefox 22.0.0.4917
  • Mozilla Firefox 23.0
  • Mozilla Firefox 23.0.1
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  • Mozilla Firefox 24.1
  • Mozilla Firefox 24.1.1
  • Mozilla Firefox 25.0
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  • Mozilla Firefox 27.0.1
  • Mozilla Firefox 28.0
  • Mozilla Firefox 28.0.1
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  • Mozilla Firefox 3.0
  • Mozilla Firefox 3.0 Alpha
  • Mozilla Firefox 3.0 Beta 5
  • Mozilla Firefox 3.0 Beta2
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  • Mozilla Firefox 3.0.1
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  • Mozilla Firefox 3.0.11
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  • Mozilla Firefox 3.0.19
  • Mozilla Firefox 3.0.2
  • Mozilla Firefox 3.0.3
  • Mozilla Firefox 3.0.4
  • Mozilla Firefox 3.0.5
  • Mozilla Firefox 3.0.6
  • Mozilla Firefox 3.0.7
  • Mozilla Firefox 3.0.7 Beta
  • Mozilla Firefox 3.0.8
  • Mozilla Firefox 3.0.9
  • Mozilla Firefox 3.0Beta5
  • Mozilla Firefox 3.1
  • Mozilla Firefox 3.1 Beta 1
  • Mozilla Firefox 3.1 Beta 2
  • Mozilla Firefox 3.1 Beta 3
  • Mozilla Firefox 3.5.0
  • Mozilla Firefox 3.5.1
  • Mozilla Firefox 3.5.10
  • Mozilla Firefox 3.5.11
  • Mozilla Firefox 3.5.12
  • Mozilla Firefox 3.5.13
  • Mozilla Firefox 3.5.14
  • Mozilla Firefox 3.5.15
  • Mozilla Firefox 3.5.16
  • Mozilla Firefox 3.5.17
  • Mozilla Firefox 3.5.18
  • Mozilla Firefox 3.5.19
  • Mozilla Firefox 3.5.2
  • Mozilla Firefox 3.5.3
  • Mozilla Firefox 3.5.4
  • Mozilla Firefox 3.5.5
  • Mozilla Firefox 3.5.6
  • Mozilla Firefox 3.5.7
  • Mozilla Firefox 3.5.8
  • Mozilla Firefox 3.5.9
  • Mozilla Firefox 3.6
  • Mozilla Firefox 3.6 A1 Pre
  • Mozilla Firefox 3.6 Beta 2
  • Mozilla Firefox 3.6 Beta 3
  • Mozilla Firefox 3.6.1
  • Mozilla Firefox 3.6.10
  • Mozilla Firefox 3.6.11
  • Mozilla Firefox 3.6.12
  • Mozilla Firefox 3.6.13
  • Mozilla Firefox 3.6.14
  • Mozilla Firefox 3.6.15
  • Mozilla Firefox 3.6.16
  • Mozilla Firefox 3.6.17
  • Mozilla Firefox 3.6.18
  • Mozilla Firefox 3.6.19
  • Mozilla Firefox 3.6.2
  • Mozilla Firefox 3.6.20
  • Mozilla Firefox 3.6.21
  • Mozilla Firefox 3.6.22
  • Mozilla Firefox 3.6.23
  • Mozilla Firefox 3.6.24
  • Mozilla Firefox 3.6.25
  • Mozilla Firefox 3.6.26
  • Mozilla Firefox 3.6.27
  • Mozilla Firefox 3.6.28
  • Mozilla Firefox 3.6.3
  • Mozilla Firefox 3.6.4
  • Mozilla Firefox 3.6.5
  • Mozilla Firefox 3.6.6
  • Mozilla Firefox 3.6.7
  • Mozilla Firefox 3.6.8
  • Mozilla Firefox 3.7 A1 Pre
  • Mozilla Firefox 30.0
  • Mozilla Firefox 31
  • Mozilla Firefox 31.0
  • Mozilla Firefox 31.1
  • Mozilla Firefox 31.1.0
  • Mozilla Firefox 31.6
  • Mozilla Firefox 31.8
  • Mozilla Firefox 31.8.0
  • Mozilla Firefox 32.0
  • Mozilla Firefox 32.0.3
  • Mozilla Firefox 33.0
  • Mozilla Firefox 34
  • Mozilla Firefox 34.0.5
  • Mozilla Firefox 35
  • Mozilla Firefox 35.0.1
  • Mozilla Firefox 36
  • Mozilla Firefox 36.0.3
  • Mozilla Firefox 36.0.4
  • Mozilla Firefox 37
  • Mozilla Firefox 37.0.1
  • Mozilla Firefox 37.0.2
  • Mozilla Firefox 38
  • Mozilla Firefox 39
  • Mozilla Firefox 39.0.3
  • Mozilla Firefox 4.0
  • Mozilla Firefox 4.0 BETA2
  • Mozilla Firefox 4.0 Beta1
  • Mozilla Firefox 4.0 Beta10
  • Mozilla Firefox 4.0 Beta11
  • Mozilla Firefox 4.0 Beta12
  • Mozilla Firefox 4.0 Beta3
  • Mozilla Firefox 4.0 Beta4
  • Mozilla Firefox 4.0 Beta5
  • Mozilla Firefox 4.0 Beta6
  • Mozilla Firefox 4.0 Beta7
  • Mozilla Firefox 4.0 Beta8
  • Mozilla Firefox 4.0 Beta9
  • Mozilla Firefox 4.0.1
  • Mozilla Firefox 40
  • Mozilla Firefox 40.0.3
  • Mozilla Firefox 41
  • Mozilla Firefox 41.0.2
  • Mozilla Firefox 42
  • Mozilla Firefox 43
  • Mozilla Firefox 43.0.1
  • Mozilla Firefox 43.0.2
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  • Mozilla Firefox 45
  • Mozilla Firefox 45.0.2
  • Mozilla Firefox 46
  • Mozilla Firefox 46.0.1
  • Mozilla Firefox 47
  • Mozilla Firefox 48
  • Mozilla Firefox 49
  • Mozilla Firefox 49.0.1
  • Mozilla Firefox 49.0.2
  • Mozilla Firefox 5.0
  • Mozilla Firefox 5.0.1
  • Mozilla Firefox 50
  • Mozilla Firefox 50.0.1
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  • Mozilla Firefox 50.1
  • Mozilla Firefox 51
  • Mozilla Firefox 52
  • Mozilla Firefox 52.0.1
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  • Mozilla Firefox 53.0.2
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  • Mozilla Firefox 57
  • Mozilla Firefox 57.0.1
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  • Mozilla Firefox 58.0.1
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  • Mozilla Firefox 59.0.1
  • Mozilla Firefox 59.0.2
  • Mozilla Firefox 6.0
  • Mozilla Firefox 6.0.1
  • Mozilla Firefox 6.0.2
  • Mozilla Firefox 60
  • Mozilla Firefox 60.0.2
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  • Mozilla Firefox 62.0.2
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  • Mozilla Firefox 63
  • Mozilla Firefox 63.0.3
  • Mozilla Firefox 64
  • Mozilla Firefox 65
  • Mozilla Firefox 65.0.1
  • Mozilla Firefox 65.0.2
  • Mozilla Firefox 66
  • Mozilla Firefox 66.0.1
  • Mozilla Firefox 66.0.2
  • Mozilla Firefox 66.0.3
  • Mozilla Firefox 66.0.4
  • Mozilla Firefox 66.0.5
  • Mozilla Firefox 67
  • Mozilla Firefox 67.0.2
  • Mozilla Firefox 67.0.3
  • Mozilla Firefox 67.0.4
  • Mozilla Firefox 68
  • Mozilla Firefox 68.0.1
  • Mozilla Firefox 68.0.2
  • Mozilla Firefox 69
  • Mozilla Firefox 69.0.1
  • Mozilla Firefox 69.0.2
  • Mozilla Firefox 7
  • Mozilla Firefox 7.0
  • Mozilla Firefox 7.0.1
  • Mozilla Firefox 8.0
  • Mozilla Firefox 8.0.1
  • Mozilla Firefox 9.0
  • Mozilla Firefox 9.0.1
  • Mozilla Firefox ESR 10.0
  • Mozilla Firefox ESR 10.0.1
  • Mozilla Firefox ESR 10.0.10
  • Mozilla Firefox ESR 10.0.11
  • Mozilla Firefox ESR 10.0.12
  • Mozilla Firefox ESR 10.0.2
  • Mozilla Firefox ESR 10.0.3
  • Mozilla Firefox ESR 10.0.4
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  • Mozilla Firefox ESR 10.0.6
  • Mozilla Firefox ESR 10.0.7
  • Mozilla Firefox ESR 10.0.8
  • Mozilla Firefox ESR 10.0.9
  • Mozilla Firefox ESR 17.0
  • Mozilla Firefox ESR 17.0.1
  • Mozilla Firefox ESR 17.0.10
  • Mozilla Firefox ESR 17.0.11
  • Mozilla Firefox ESR 17.0.2
  • Mozilla Firefox ESR 17.0.3
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  • Mozilla Firefox ESR 17.0.5
  • Mozilla Firefox ESR 17.0.6
  • Mozilla Firefox ESR 17.0.7
  • Mozilla Firefox ESR 17.0.8
  • Mozilla Firefox ESR 17.0.9
  • Mozilla Firefox ESR 24.0
  • Mozilla Firefox ESR 24.0.1
  • Mozilla Firefox ESR 24.0.2
  • Mozilla Firefox ESR 24.1
  • Mozilla Firefox ESR 24.1.0
  • Mozilla Firefox ESR 24.1.1
  • Mozilla Firefox ESR 24.2
  • Mozilla Firefox ESR 24.3
  • Mozilla Firefox ESR 24.4
  • Mozilla Firefox ESR 24.5
  • Mozilla Firefox ESR 24.6
  • Mozilla Firefox ESR 24.7
  • Mozilla Firefox ESR 24.8
  • Mozilla Firefox ESR 24.8.1
  • Mozilla Firefox ESR 31.0
  • Mozilla Firefox ESR 31.1
  • Mozilla Firefox ESR 31.1.0
  • Mozilla Firefox ESR 31.1.1
  • Mozilla Firefox ESR 31.2
  • Mozilla Firefox ESR 31.3
  • Mozilla Firefox ESR 31.3.0
  • Mozilla Firefox ESR 31.4
  • Mozilla Firefox ESR 31.5
  • Mozilla Firefox ESR 31.5.2
  • Mozilla Firefox ESR 31.5.3
  • Mozilla Firefox ESR 31.6
  • Mozilla Firefox ESR 31.7
  • Mozilla Firefox ESR 31.8
  • Mozilla Firefox ESR 38.1
  • Mozilla Firefox ESR 38.1.1
  • Mozilla Firefox ESR 38.2
  • Mozilla Firefox ESR 38.2.1
  • Mozilla Firefox ESR 38.3
  • Mozilla Firefox ESR 38.4
  • Mozilla Firefox ESR 38.5
  • Mozilla Firefox ESR 38.5.1
  • Mozilla Firefox ESR 38.5.2
  • Mozilla Firefox ESR 38.6
  • Mozilla Firefox ESR 38.6.1
  • Mozilla Firefox ESR 38.7
  • Mozilla Firefox ESR 38.8
  • Mozilla Firefox ESR 45.1
  • Mozilla Firefox ESR 45.2
  • Mozilla Firefox ESR 45.3
  • Mozilla Firefox ESR 45.4
  • Mozilla Firefox ESR 45.5
  • Mozilla Firefox ESR 45.5.1
  • Mozilla Firefox ESR 45.6
  • Mozilla Firefox ESR 45.7
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  • Mozilla Firefox ESR 45.9
  • Mozilla Firefox ESR 52.0.1
  • Mozilla Firefox ESR 52.1
  • Mozilla Firefox ESR 52.1.1
  • Mozilla Firefox ESR 52.2
  • Mozilla Firefox ESR 52.3
  • Mozilla Firefox ESR 52.4
  • Mozilla Firefox ESR 52.5
  • Mozilla Firefox ESR 52.5.2
  • Mozilla Firefox ESR 52.6
  • Mozilla Firefox ESR 52.7
  • Mozilla Firefox ESR 52.7.2
  • Mozilla Firefox ESR 52.7.3
  • Mozilla Firefox ESR 52.8
  • Mozilla Firefox ESR 52.8.1
  • Mozilla Firefox ESR 52.9
  • Mozilla Firefox ESR 60
  • Mozilla Firefox ESR 60.0.2
  • Mozilla Firefox ESR 60.1
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  • Mozilla Firefox ESR 60.2.1
  • Mozilla Firefox ESR 60.2.2
  • Mozilla Firefox ESR 60.3
  • Mozilla Firefox ESR 60.4
  • Mozilla Firefox ESR 60.5
  • Mozilla Firefox ESR 60.5.1
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  • Mozilla Firefox ESR 60.7
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  • Mozilla Firefox ESR 60.8
  • Mozilla Firefox ESR 68.0.1
  • Mozilla Firefox ESR 68.0.2
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  • Mozilla Firefox Preview Release
  • Ubuntu Ubuntu Linux 12.04 ESM
  • Ubuntu Ubuntu Linux 14.04 ESM
  • Ubuntu Ubuntu Linux 16.04 LTS
  • Ubuntu Ubuntu Linux 18.04 LTS
  • Ubuntu Ubuntu Linux 19.04

Recommendations

Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer at the network boundary if global access isn’t needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity including unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Modify default ACL settings.
Implement database access control to limit the immediate impact of such vulnerabilities on the data and possibly the database itself. Ensure that applications are isolated from one another and from sensitive data through separate user accounts and restrictive ACL configurations

Run all software as a nonprivileged user with minimal access rights.
To limit the impact of latent vulnerabilities, configure servers and other applications to run as a nonadministrative user with minimal access rights.

Updates are available. Please see the references or vendor advisory for more information.