oss-sec mailing list archives
Re: Re: CVE request: heap buffer overflow in glibc swscanf
From: Florian Weimer <fweimer () redhat com>
Date: Wed, 04 Feb 2015 10:42:41 +0100
On 02/04/2015 04:16 AM, cve-assign () mitre org wrote:
The check with __libc_use_alloca also checks against the number of array entries to allocate rather than the number of bytes, so the function can allocate up to four times as many bytes as is libc policy on the stack in the wide character case.Here, it seems that the goal of the policy is risk management for use of alloca. This is security relevant for some applications that use glibc, because it could (for example) allow a denial of service attack that's intended to trigger a failed alloca. There was one intended policy, and the the incorrect "__libc_use_alloca (newsize)" caused a different (and weaker) policy to be enforced instead.
If you want to assign CVE IDs for stack overflows in glibc without demonstrated application impact, we really need to find a way to streamline the process because there are quite a few missing assignments. I wouldn't mind getting a pool of CVEs (for multiple years, going back to around 2000), and assigning them to issues in the glibc Bugzilla instance, and posting weekly summaries to oss-security. Would that work for you? -- Florian Weimer / Red Hat Product Security
Current thread:
- CVE request: heap buffer overflow in glibc swscanf Paul Pluzhnikov (Feb 01)
- Re: CVE request: heap buffer overflow in glibc swscanf cve-assign (Feb 03)
- Re: Re: CVE request: heap buffer overflow in glibc swscanf Daniel Micay (Feb 03)
- Re: Re: CVE request: heap buffer overflow in glibc swscanf Florian Weimer (Feb 04)
- <Possible follow-ups>
- Re: CVE request: heap buffer overflow in glibc swscanf Gsunde Orangen (Feb 03)
- Re: CVE request: heap buffer overflow in glibc swscanf cve-assign (Feb 03)