CVE-2021-3516

There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

The libxml2 library is a development toolbox providing the implementation of various XML standards.

Security Fix(es):

• libxml2: Use-after-free in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3516)

• libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3517)

• libxml2: Use-after-free in xmlXIncludeDoProcess() in xinclude.c (CVE-2021-3518)

• libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode (CVE-2021-3537)

• libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms (CVE-2021-3541)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

The libxml2 library is a development toolbox providing the implementation of various XML standards.

Security Fix(es):

• libxml2: Use-after-free in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3516)

• libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3517)

• libxml2: Use-after-free in xmlXIncludeDoProcess() in xinclude.c (CVE-2021-3518)

• libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode (CVE-2021-3537)

• libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms (CVE-2021-3541)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

• CVE-2021-3517.patch: validate UTF8 in xmlEncodeEntities
• CVE-2021-3518.patch: fix user-after-free with 'xmllint --xinclude --dropdtd'
• CVE-2021-3537.patch: propagate error in xmlParseElementChildrenContentDeclPriv
• CVE-2021-3541.patch: parser fix for the billion laughs attack
• CVE-2021-3516.patch: fix use-after-free with 'xmllint --html --push'
• CVE-2017-8872.patch: free input buffer in xmlHaltParser
• CVE-2019-20388.patch: fix memory leak in xmlSchemaValidateStream
• CVE-2020-24977.patch: fix out-of-bounds read with 'xmllint --htmlout'

• SECURITY UPDATE: Out-of-bounds array access
  • debian/patches/CVE-2021-3517.patch: Validate UTF8 in xmlEncodeEntities
  • CVE-2021-3517
• SECURITY UPDATE: Use-after-free error
  • debian/patches/CVE-2021-3518.patch: Fix use-after-free with 'xmllint --xinclude --dropdtd'
  • CVE-2021-3518
• SECURITY UPDATE: Null pointer dereference while parsing in recovery mode
  • debian/patches/CVE-2021-3537.patch: Propagate error in xmlParseElementChildrenContentDeclPriv
  • CVE-2021-3537
• SECURITY UPDATE: Parser fix for the billion laugs attach
  • debian/patches/CVE-2021-3541.patch: Fix parameter entities expansion in xmlParserEntityCheck
  • CVE-2021-3541
• SECURITY UPDATE: Miscalculation of available bytes when parsing
  • debian/patches/CVE-2017-8872.patch: Free input buffer in xmlHaltParser
  • CVE-2017-8872
• SECURITY UPDATE: Memory leak
  • debian/patches/CVE-2019-20388.patch: Fix memory leak in xmlSchemaValidateStream
  • CVE-2019-20388
• SECURITY UPDATE: Out-of-bounds array access
  • debian/patches/CVE-2020-24977.patch: Fix out-of-bounds read with 'xmllint --htmlout'
  • CVE-2020-24977
• SECURITY UPDATE: Use-after-free error
  • debian/patches/CVE-2021-3516.patch: Fix use-after-free with 'xmllint --html --push'
  • CVE-2021-3516

• CVE-2021-3517.patch: validate UTF8 in xmlEncodeEntities
• CVE-2021-3518.patch: fix user-after-free with 'xmllint --xinclude --dropdtd'
• CVE-2021-3537.patch: propagate error in xmlParseElementChildrenContentDeclPriv
• CVE-2021-3541.patch: parser fix for the billion laughs attack
• CVE-2021-3516.patch: fix use-after-free with 'xmllint --html --push'
• CVE-2017-8872.patch: free input buffer in xmlHaltParser
• CVE-2019-20388.patch: fix memory leak in xmlSchemaValidateStream
• CVE-2020-24977.patch: fix out-of-bounds read with 'xmllint --htmlout'

The updated packages fix security vulnerabilities:

Use-after-free in xmlEncodeEntitiesInternal() in entities.c. (CVE-2021-3516)

Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c. (CVE-2021-3517)

Use-after-free in xmlXIncludeDoProcess() in xinclude.c. (CVE-2021-3518)

NULL pointer dereference in valid.c in xmlValidBuildAContentModel. (CVE-2021-3537)

This update for libxml2 fixes the following issues:

• CVE-2021-3518: Fixed a use after free in xinclude.c:xmlXIncludeDoProcess (bsc#1185408).
• CVE-2021-3517: Fixed a heap based buffer overflow in entities.c:xmlEncodeEntitiesInternal (bsc#1185410).
• CVE-2021-3516: Fixed a use after free in entities.c:xmlEncodeEntitiesInternal (bsc#1185409).

This update was imported from the SUSE:SLE-15:Update update project.

This update for libxml2 fixes the following issues:

• CVE-2021-3537: NULL pointer dereference in valid.c:xmlValidBuildAContentModel (bsc#1185698)
• CVE-2021-3518: Fixed a use after free in xinclude.c:xmlXIncludeDoProcess (bsc#1185408).
• CVE-2021-3517: Fixed a heap based buffer overflow in entities.c:xmlEncodeEntitiesInternal (bsc#1185410).
• CVE-2021-3516: Fixed a use after free in entities.c:xmlEncodeEntitiesInternal (bsc#1185409).

This update was imported from the SUSE:SLE-15:Update update project.

These are all security issues fixed in the libxml2-2-2.9.12-1.2 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the ruby2.7-rubygem-nokogiri-1.12.3-1.2 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the ruby3.1-rubygem-nokogiri-1.13.3-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the ruby3.2-rubygem-nokogiri-1.13.9-1.7 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the ruby3.3-rubygem-nokogiri-1.15.5-1.5 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the ruby3.4-rubygem-nokogiri-1.18.2-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the ruby4.0-rubygem-nokogiri-1.18.9-1.4 package on the GA media of openSUSE Tumbleweed.

This update for libxml2 fixes the following issues:

Security issues fixed:

• CVE-2021-3537: NULL pointer dereference in valid.c:xmlValidBuildAContentModel (bsc#1185698)
• CVE-2021-3518: Fixed a use after free in xinclude.c:xmlXIncludeDoProcess (bsc#1185408).
• CVE-2021-3517: Fixed a heap based buffer overflow in entities.c:xmlEncodeEntitiesInternal (bsc#1185410).
• CVE-2021-3516: Fixed a use after free in xmlEncodeEntitiesInternal() in entities.c (bsc#1185409)
• CVE-2020-24977: Fixed a global-buffer-overflow in xmlEncodeEntitiesInternal (bsc#1176179).
• CVE-2019-20388: Fixed a memory leak in xmlSchemaPreRun (bsc#1161521).
• CVE-2020-7595: Fixed an infinite loop in an EOF situation (bsc#1161517).
• CVE-2019-19956: Fixed a memory leak in xmlParseBalancedChunkMemoryRecover (bsc#1159928).

This update for libxml2 fixes the following issues:

• CVE-2021-3518: Fixed a use after free in xinclude.c:xmlXIncludeDoProcess (bsc#1185408).
• CVE-2021-3517: Fixed a heap based buffer overflow in entities.c:xmlEncodeEntitiesInternal (bsc#1185410).
• CVE-2021-3516: Fixed a use after free in entities.c:xmlEncodeEntitiesInternal (bsc#1185409).

This update for libxml2 fixes the following issues:

• CVE-2021-3518: Fixed a use after free in xinclude.c:xmlXIncludeDoProcess (bsc#1185408).
• CVE-2021-3517: Fixed a heap based buffer overflow in entities.c:xmlEncodeEntitiesInternal (bsc#1185410).
• CVE-2021-3516: Fixed a use after free in entities.c:xmlEncodeEntitiesInternal (bsc#1185409).

This update for libxml2 fixes the following issues:

• CVE-2021-3537: NULL pointer dereference in valid.c:xmlValidBuildAContentModel (bsc#1185698)
• CVE-2021-3518: Fixed a use after free in xinclude.c:xmlXIncludeDoProcess (bsc#1185408).
• CVE-2021-3517: Fixed a heap based buffer overflow in entities.c:xmlEncodeEntitiesInternal (bsc#1185410).
• CVE-2021-3516: Fixed a use after free in entities.c:xmlEncodeEntitiesInternal (bsc#1185409).

This update for libxml2 fixes the following issues:

Security issues fixed:

CVE-2021-3537: NULL pointer dereference in valid.c:xmlValidBuildAContentModel (bsc#1185698)

• CVE-2021-3518: Fixed a use after free in xinclude.c:xmlXIncludeDoProcess (bsc#1185408).
• CVE-2021-3517: Fixed a heap based buffer overflow in entities.c:xmlEncodeEntitiesInternal (bsc#1185410).
• CVE-2021-3516: Fixed a use after free in entities.c:xmlEncodeEntitiesInternal (bsc#1185409).

Yunho Kim discovered that libxml2 incorrectly handled certain error conditions. A remote attacker could exploit this with a crafted XML file to cause a denial of service, or possibly cause libxml2 to expose sensitive information. This issue only affected Ubuntu 14.04 ESM, and Ubuntu 16.04 ESM. (CVE-2017-8872)

Zhipeng Xie discovered that libxml2 incorrectly handled certain XML schemas. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, and Ubuntu 18.04 LTS. (CVE-2019-20388)

It was discovered that libxml2 incorrectly handled invalid UTF-8 input. A remote attacker could possibly exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2020-24977)

It was discovered that libxml2 incorrectly handled invalid UTF-8 input. A remote attacker could possibly exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. (CVE-2021-3517)

It was discovered that libxml2 did not properly handle certain crafted XML files. A local attacker could exploit this with a crafted input to cause libxml2 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-3516, CVE-2021-3518)

It was discovered that libxml2 incorrectly handled error states. A remote attacker could exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. (CVE-2021-3537)

Sebastian Pipping discovered that libxml2 did not properly handle certain crafted XML files. A remote attacker could exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-3541)