PT-2020-19733 · Russell Haering · Goxmldsig+1

Steven Johnstone · CVE-2020-7711 · Published 2020-08-23 · Updated 2022-11-15

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions github.com/russellhaering/goxmldsig versions prior to 1.1.1 github.com/russellhaering/gosaml2 versions prior to 0.7.0

Description The issue is caused by a nil-pointer dereference when sending malformed XML signatures, leading to a crash. This can be used as a denial of service vector if user-supplied signatures are being validated. The problem occurs when an attacker supplies an invalid assertion, triggering a panic.

Recommendations For github.com/russellhaering/goxmldsig versions prior to 1.1.1, update to version 1.1.1 to resolve the issue. For github.com/russellhaering/gosaml2 versions prior to 0.7.0, update to version 0.7.0 to resolve the issue. As a temporary workaround for github.com/russellhaering/gosaml2, callers can use recover() to handle panics and mitigate the potential denial of service vector.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2020-7711

GHSA-GQ5R-CC4W-G8XF

GHSA-MQQV-CHPX-VQ25

GHSA-PRJQ-F4Q3-FVFR

GO-2020-0046

SNYK-GOLANG-GITHUBCOMRUSSELLHAERINGGOSAML2-608302

SNYK-GOLANG-GITHUBCOMRUSSELLHAERINGGOXMLDSIG-608301

Affected Products

Gosaml2

Goxmldsig

References · 24

• 🔥 https://github.com/russellhaering/goxmldsig/issues/48 · Exploit
• https://cve.org/CVERecord?id=CVE-2020-7711 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-7711 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-7731 · Security Note
• https://osv.dev/vulnerability/CVE-2020-7711 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-gq5r-cc4w-g8xf · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-7711 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2020-0046 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-7711 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2020-7711 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-mqqv-chpx-vq25 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-7711 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-prjq-f4q3-fvfr · Vendor Advisory
• https://github.com/russellhaering/gosaml2/issues/59 · Note
• https://github.com/russellhaering/gosaml2 · Note