Bug 1710620 (CVE-2019-5436)
| Summary: | CVE-2019-5436 curl: TFTP receive heap buffer overflow in tftp_receive_packet() function | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Pedro Sampaio <psampaio> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | andrew.slice, bodavis, csutherl, dbhole, gzaronik, hhorak, jclere, john.j5live, jorton, kanderso, kdudka, lgao, luhliari, mbabacek, msekleta, mturk, myarboro, omajid, paul, rwagner, security-response-team, twalsh, weli |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | curl 7.65.0 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-03-31 22:34:12 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: | 1711839, 1711840, 1711841, 1712840, 1829562 | ||
| Bug Blocks: | 1710621 | ||
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Description
Pedro Sampaio
2019-05-15 21:07:45 UTC
libcurl contains a heap buffer overflow in the function (`tftp_receive_packet()`) that recevives data from a TFTP server. It calls `recvfrom()` with the default size for the buffer rather than with the size that was used to allocate it. Thus, the content that might overwrite the heap memory is entirely controlled by the server. The flaw exists if the user selects to use a "blksize" of 504 or smaller (default is 512). The smaller size that is used, the larger the possible overflow becomes. Users chosing a smaller size than default should be rare as the primary use case for changing the size is to make it larger. It is rare for users to use TFTP across the Internet. It is most commonly used within local networks. Acknowledgments: Name: the Curl project Upstream: l00p3r Created curl tracking bugs for this issue: Affects: fedora-all [bug 1712840] This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:1020 https://access.redhat.com/errata/RHSA-2020:1020 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-2019-5436 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:1792 https://access.redhat.com/errata/RHSA-2020:1792 External References: https://curl.haxx.se/docs/CVE-2019-5436.html Statement: This flaw exists if the user selects to use a "blksize" of 504 or smaller (default is 512). The smaller size that is used, the larger the possible overflow becomes. Users choosing a smaller size than default should be rare as the primary use case for changing the size is to make it larger. It is rare for users to use TFTP across the Internet. It is most commonly used within local networks. This issue has been addressed in the following products: Red Hat Enterprise Linux 7.7 Extended Update Support Via RHSA-2020:2505 https://access.redhat.com/errata/RHSA-2020:2505 |