Description
<p>A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.</p> <p>The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded.</p> <p>The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.</p>
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
E
Physical
RL
O
RC
Changed
Affected products
- Microsoft / asp.net_core2.1* – 2.1*
- Microsoft / asp.net_core3.1 – 3.1
References
- VENDOR_ADVISORYhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045
- MAILING_LISThttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LN2FUVBSVPGK7AU3NMLO3YR6CGONQPB/
- MAILING_LISThttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ASICXQXS4M7MTAF6SGQMCLCA63DLCUT3/
- MISChttps://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md#changes-in-318
- VENDOR_ADVISORYhttps://security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2020:3699