Buffer Overflow in IMAP handler (CVE-2017-1000257)
Summary
Vulnerability in IMAP handler (CVE-2017-1000257). Confidential information can be exposed externally.
Original description
The description as published by the source.
libcurl contains a buffer overrun flaw in the IMAP handler.
An IMAP FETCH response line indicates the size of the returned data, in number
of bytes. When that response says the data is zero bytes, libcurl would pass
on that (non-existing) data with a pointer and the size (zero) to the
deliver-data function.
libcurl's deliver-data function treats zero as a magic number and invokes
strlen() on the data to figure out the length. The strlen() is called on a
heap based buffer that might not be null-terminated so libcurl might read
beyond the end of it into whatever memory lies after (or crash) and then
deliver that to the application as if it was actually downloaded.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2017-1000257 has been found in IMAP handler.
Confidential information can be exposed externally. CVSS score: 9.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "IMAP handler CVE-2017-1000257" on the vendor's site.
CVE-2017-1000257 (IMAP handler) — CWE-119 / CVSS v3 9.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-119) exists in IMAP handler.
Check the vendor advisory for the affected versions of IMAP handler.
Severity: Critical (CVSS 9.1/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで IMAP handler を使っているサービスとバージョンを洗い出す。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2017-1000257 curl Fixed in: 7.56.1-r0
- Debian DEBIAN-CVE-2017-1000257 curl Fixed in: 7.56.1-1
References
- advisory debian.org
- advisory securityfocus.com
- advisory securitytracker.com
- patch curl.haxx.se
- web access.redhat.com
- web access.redhat.com
- web access.redhat.com
- web security.gentoo.org