CVE-2020-29509 log

Source	CVE Red Hat MITRE NVD Debian Ubuntu SUSE Alpine Mageia CVE Details CIRCL Bugs Arch Linux Red Hat Gentoo SUSE GitHub Lists oss-security full-disclosure bugtraq Misc GitHub code web search
Severity	Medium
Remote	Yes
Type	Incorrect calculation
Description	Go's encoding/xml handles namespace prefixes on XML attributes in a way that causes crafted markup to mutate during round-trips through the xml.Decoder and xml.Encoder implementations. Encoding and decoding using Go's encoding/xml can change the observed namespace as well as the observed local name of a maliciously crafted XML attribute. Affected applications include software that relies on XML integrity for security-sensitive decisions. Prominent examples of such applications include SAML and XML-DSig implementations.

Group	Package	Affected	Fixed	Severity	Status	Ticket
AVG-1358	mattermost	5.26.1-1	5.26.2-1	Medium	Fixed
AVG-1357	go	2:1.16.7-1	2:1.17-1	Medium	Fixed

References
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md https://github.com/mattermost/xml-roundtrip-validator https://github.com/golang/go/issues/43168 https://go-review.googlesource.com/c/go/+/277892 https://github.com/golang/go/commit/4d014e723165f28b34458edb4aa9136e0fb4c702

References

https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md
https://github.com/mattermost/xml-roundtrip-validator
https://github.com/golang/go/issues/43168
https://go-review.googlesource.com/c/go/+/277892
https://github.com/golang/go/commit/4d014e723165f28b34458edb4aa9136e0fb4c702

Notes
Workaround ========== The github.com/mattermost/xml-roundtrip-validator module can detect unstable constructs in an XML document, including unstable attribute namespace prefixes. Invoking the validator on all untrusted markup and failing early if it returns an error can prevent these types of issue from being exploited in an otherwise affected application.

Notes

Workaround
==========

The github.com/mattermost/xml-roundtrip-validator module can detect unstable constructs in an XML document, including unstable attribute namespace prefixes. Invoking the validator on all untrusted markup and failing early if it returns an error can prevent these types of issue from being exploited in an otherwise affected application.