Bug 1844171 (CVE-2020-11087)
| Summary: | CVE-2020-11087 freerdp: out-of-bounds read in ntlm_read_AuthenticateMessage | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Guilherme de Almeida Suckevicz <gsuckevi> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | mads, negativo17, oholy, pahan |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | freerdp 2.1.0 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-09-29 22:01:38 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1844172, 1844174, 1844175, 1844176, 1844586, 1844587 | ||
| Bug Blocks: | 1844196 | ||
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Description
Guilherme de Almeida Suckevicz
2020-06-04 18:18:35 UTC
Created freerdp tracking bugs for this issue: Affects: epel-6 [bug 1844174] Affects: fedora-all [bug 1844172] Created freerdp1.2 tracking bugs for this issue: Affects: epel-7 [bug 1844176] Affects: fedora-all [bug 1844175] Technical Summary:
The fields->Len member is retrieved from the stream and can be controlled by user input. First, the call ntlm_read_message_fields(s, &(message->NtChallengeResponse) reads in the NtChallengeResponse message data from the stream, including the fields->Len. Subsequently, the code:
wStream* snt =
Stream_New(message->NtChallengeResponse.Buffer, message->NtChallengeResponse.Len);
computes the stream pointer and is passed to ntlm_read_ntlm_v2_response(), which could cause an out-of-bounds read of 16+ bytes originating at snt. The patch for this uses Stream_GetRemainingLength() to avoid overreading the buffer and adds SECURITY_STATUS error reporting.
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:4031 https://access.redhat.com/errata/RHSA-2020:4031 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-11087 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:4647 https://access.redhat.com/errata/RHSA-2020:4647 |