CVE-2017-9047
טרם דורגה
תיאור (מקור, אנגלית)
A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer 'buf' of size 'size'. The variable len is assigned strlen(buf). If the content->type is XML_ELEMENT_CONTENT_ELEMENT, then (i) the content->prefix is appended to buf (if it actually fits) whereupon (ii) content->name is written to the buffer. However, the check for whether the content->name actually fits also uses 'len' rather than the updated buffer length strlen(buf). This allows us to write about "size" many bytes beyond the allocated memory. This vulnerability causes programs that use libxml2, such as PHP, to crash.
מדדים
- EPSS — סבירות ניצול
- 3% (אחוזון 100) נכון ל-14/10/2026
- CWE
- CWE-119
מוצרים מושפעים
xmlsoft: libxml2
קישורים
- http://www.openwall.com/lists/oss-security/2017/05/15/1 ExploitMailing ListPatchThird Party Advisory
- http://www.openwall.com/lists/oss-security/2017/05/15/1 ExploitMailing ListPatchThird Party Advisory
- http://www.debian.org/security/2017/dsa-3952
- http://www.securityfocus.com/bid/98599 Third Party AdvisoryVDB Entry
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600…
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61c…
- https://security.gentoo.org/glsa/201711-01
- http://www.debian.org/security/2017/dsa-3952
- http://www.securityfocus.com/bid/98599 Third Party AdvisoryVDB Entry
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600…